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Dive into the research topics where Ron van Golde is active.

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Featured researches published by Ron van Golde.


The New England Journal of Medicine | 2016

Randomized Trial of a Lifestyle Program in Obese Infertile Women

Meike Mutsaerts; Anne M. van Oers; Henk Groen; Jan M. Burggraaff; Walter K. H. Kuchenbecker; Denise A. M. Perquin; Carolien A. M. Koks; Ron van Golde; Eugenie M. Kaaijk; Jaap M. Schierbeek; G.J.E. Oosterhuis; Frank J. Broekmans; Wanda J. E. Bemelmans; Cornelis B. Lambalk; M.F.G. Verberg; Fulco van der Veen; Nicole F. Klijn; Patricia E.A.M. Mercelina; Yvonne M. van Kasteren; Annemiek W. Nap; Egbert A. Brinkhuis; Niels E. A. Vogel; Robert J. A. B. Mulder; Ed T. C. M. Gondrie; Jan Bruin; J. Marko Sikkema; Mathieu H.G. de Greef; Nancy C. W. ter Bogt; Jolande A. Land; Ben Willem J. Mol

BACKGROUND Small lifestyle-intervention studies suggest that modest weight loss increases the chance of conception and may improve perinatal outcomes, but large randomized, controlled trials are lacking. METHODS We randomly assigned infertile women with a body-mass index (the weight in kilograms divided by the square of the height in meters) of 29 or higher to a 6-month lifestyle intervention preceding treatment for infertility or to prompt treatment for infertility. The primary outcome was the vaginal birth of a healthy singleton at term within 24 months after randomization. RESULTS We assigned women who did not conceive naturally to one of two treatment strategies: 290 women were assigned to a 6-month lifestyle-intervention program preceding 18 months of infertility treatment (intervention group) and 287 were assigned to prompt infertility treatment for 24 months (control group). A total of 3 women withdrew consent, so 289 women in the intervention group and 285 women in the control group were included in the analysis. The discontinuation rate in the intervention group was 21.8%. In intention-to-treat analyses, the mean weight loss was 4.4 kg in the intervention group and 1.1 kg in the control group (P<0.001). The primary outcome occurred in 27.1% of the women in the intervention group and 35.2% of those in the control group (rate ratio in the intervention group, 0.77; 95% confidence interval, 0.60 to 0.99). CONCLUSIONS In obese infertile women, a lifestyle intervention preceding infertility treatment, as compared with prompt infertility treatment, did not result in higher rates of a vaginal birth of a healthy singleton at term within 24 months after randomization. (Funded by the Netherlands Organization for Health Research and Development; Netherlands Trial Register number, NTR1530.).


The Journal of Urology | 2002

Is increased CAG repeat length in the androgen receptor gene a risk factor for male subfertility

Ron van Golde; Kjeld van Houwelingen; Lambertus A. Kiemeney; J.A.M. Kremer; J.H.A.M. Tuerlings; Jack A. Schalken; Eric Meuleman

PURPOSE Increased length of the CAG repeat in the androgen receptor gene may be related to male subfertility. Expansion to 38-62 CAG repeats leads to the neurodegenerative disorder with male infertility called Kennedys disease. Recently it was suggested that slight expansion is related to male subfertility. In this study we investigated the association of male subfertility with the length of CAG repeats in the androgen receptor. MATERIALS AND METHODS CAG repeat length in the androgen receptor gene was investigated in 75 subfertile men, who were mainly candidates for intracytoplasmic sperm injection. Sperm parameters varied from azoospermia to severe oligoasthenoteratozoospermia. The control group consisted of 70 men who predominantly had bladder cancer. DNA was isolated from peripheral blood and genotyping was performed with polymerase chain reaction based methods. RESULTS No statistically significant difference in the mean length of the CAG repeat plus or minus standard deviation was noted in subfertile men and controls (22.2 +/- 3.1 and 21.7 +/- 3.4, respectively). The length of the CAG repeat in the androgen receptor was not related to the degree of impaired spermatogenesis or clinical characteristics of the subfertile men. CONCLUSIONS Increased length of CAG repeats in the androgen receptor gene is not a risk factor for male subfertility.


BMC Women's Health | 2012

The OPTIMIST study: optimisation of cost effectiveness through individualised FSH stimulation dosages for IVF treatment. A randomised controlled trial

Theodora C. van Tilborg; Marinus J.C. Eijkemans; Joop S.E. Laven; Carolien A. M. Koks; Jan Bruin; G.J. Scheffer; Ron van Golde; Kathrin Fleischer; Annemieke Hoek; Annemiek W. Nap; Walter K. H. Kuchenbecker; Petra A. P. Manger; Egbert A. Brinkhuis; Arne M. van Heusden; Alexander Sluijmer; Arie Verhoeff; Marcel van Hooff; Jaap Friederich; J.M.J. Smeenk; Janet Kwee; Harold R. Verhoeve; Cornelis B. Lambalk; Frans M. Helmerhorst; Fulco van der Veen; Ben Willem J. Mol; Helen L. Torrance; Frank J. Broekmans

BackgroundCosts of in vitro fertilisation (IVF) are high, which is partly due to the use of follicle stimulating hormone (FSH). FSH is usually administered in a standard dose. However, due to differences in ovarian reserve between women, ovarian response also differs with potential negative consequences on pregnancy rates. A Markov decision-analytic model showed that FSH dose individualisation according to ovarian reserve is likely to be cost-effective in women who are eligible for IVF. However, this has never been confirmed in a large randomised controlled trial (RCT). The aim of the present study is to assess whether an individualised FSH dose regime based on an ovarian reserve test (ORT) is more cost-effective than a standard dose regime.Methods/DesignMulticentre RCT in subfertile women indicated for a first IVF or intracytoplasmic sperm injection cycle, who are aged < 44 years, have a regular menstrual cycle and no major abnormalities at transvaginal sonography. Women with polycystic ovary syndrome, endocrine or metabolic abnormalities and women undergoing IVF with oocyte donation, will not be included. Ovarian reserve will be assessed by measuring the antral follicle count. Women with a predicted poor response or hyperresponse will be randomised for a standard versus an individualised FSH regime (150 IU/day, 225-450 IU/day and 100 IU/day, respectively). Participants will undergo a maximum of three stimulation cycles during maximally 18 months. The primary study outcome is the cumulative ongoing pregnancy rate resulting in live birth achieved within 18 months after randomisation. Secondary outcomes are parameters for ovarian response, multiple pregnancies, number of cycles needed per live birth, total IU of FSH per stimulation cycle, and costs. All data will be analysed according to the intention-to-treat principle. Cost-effectiveness analysis will be performed to assess whether the health and associated economic benefits of individualised treatment of subfertile women outweigh the additional costs of an ORT.DiscussionThe results of this study will be integrated into a decision model that compares cost-effectiveness of the three dose-adjustment strategies to a standard dose strategy. The study outcomes will provide scientific foundation for national and international guidelines.Trial registrationNTR2657


JAMA | 2016

Ovarian Stimulation for In Vitro Fertilization and Long-term Risk of Breast Cancer

Alexandra W. van den Belt-Dusebout; M. Spaan; Cornelis B. Lambalk; M. Kortman; Joop S.E. Laven; Evert J. P. van Santbrink; Lucette van der Westerlaken; Ben J. Cohlen; Didi D.M. Braat; J.M.J. Smeenk; Jolande A. Land; M. Goddijn; Ron van Golde; Minouche M.E. van Rumste; Roel Schats; Katarzyna Józwiak; Michael Hauptmann; Matti A. Rookus; Curt W. Burger; Flora E. van Leeuwen

IMPORTANCE Previous studies of breast cancer risk after in vitro fertilization (IVF) treatment were inconclusive due to limited follow-up. OBJECTIVE To assess long-term risk of breast cancer after ovarian stimulation for IVF. DESIGN, SETTING, AND PARTICIPANTS Historical cohort (OMEGA study) with complete follow-up through December 2013 for 96% of the cohort. The cohort included 19,158 women who started IVF treatment between 1983 and 1995 (IVF group) and 5950 women starting other fertility treatments between 1980 and 1995 (non-IVF group) from all 12 IVF clinics in the Netherlands. The median age at end of follow-up was 53.8 years for the IVF group and 55.3 years for the non-IVF group. EXPOSURES Information on ovarian stimulation for IVF, other fertility treatments, and potential confounders was collected from medical records and through mailed questionnaires. MAIN OUTCOMES AND MEASURES Incidence of invasive and in situ breast cancers in women who underwent fertility treatments was obtained through linkage with the Netherlands Cancer Registry (1989-2013). Breast cancer risk in the IVF group was compared with risks in the general population (standardized incidence ratios [SIRs]) and the non-IVF group (hazard ratios [HRs]). RESULTS Among 25,108 women (mean age at baseline, 32.8 years; mean number of IVF cycles, 3.6), 839 cases of invasive breast cancer and 109 cases of in situ breast cancer occurred after a median follow-up of 21.1 years. Breast cancer risk in IVF-treated women was not significantly different from that in the general population (SIR, 1.01 [95% CI, 0.93-1.09]) and from the risk in the non-IVF group (HR, 1.01 [95% CI, 0.86-1.19]). The cumulative incidences of breast cancer at age 55 were 3.0% for the IVF group and 2.9% for the non-IVF group (P = .85). The SIR did not increase with longer time since treatment (≥20 years) in the IVF group (0.92 [95% CI, 0.73-1.15]) or in the non-IVF group (1.03 [95% CI, 0.82-1.29]). Risk was significantly lower for those who underwent 7 or more IVF cycles (HR, 0.55 [95% CI, 0.39-0.77]) vs 1 to 2 IVF cycles and after poor response to the first IVF cycle (HR, 0.77 [95% CI, 0.61-0.96] for <4 vs ≥4 collected oocytes). CONCLUSIONS AND RELEVANCE Among women undergoing fertility treatment in the Netherlands between 1980 and 1995, IVF treatment compared with non-IVF treatment was not associated with increased risk of breast cancer after a median follow-up of 21 years. Breast cancer risk among IVF-treated women was also not significantly different from that in the general population. These findings are consistent with absence of a significant increase in long-term risk of breast cancer among IVF-treated women.


BMC Women's Health | 2012

The inSIGHT study : costs and effects of routine hysteroscopy prior to a first IVF treatment cycle. A randomised controlled trial

Janine G. Smit; Jenneke C. Kasius; Marinus J.C. Eijkemans; Carolien A. M. Koks; Ron van Golde; Jurjen E. Oosterhuis; Annemiek W. Nap; G.J. Scheffer; Petra A. P. Manger; Annemieke Hoek; Mesrure Kaplan; Dick B. C. Schoot; Arne M. van Heusden; Walter K. H. Kuchenbecker; Denise A. M. Perquin; Kathrin Fleischer; Eugenie M. Kaaijk; Alexander Sluijmer; Jaap Friederich; Joop S.E. Laven; Marcel van Hooff; Leonie A. Louwe; Janet Kwee; Jantien J. Boomgaard; Corry H. de Koning; Ineke C. A. H. Janssen; Femke Mol; Ben W. J. Mol; Helen L. Torrance; Frank J. Broekmans

BackgroundIn in vitro fertilization (IVF) and intracytoplasmatic sperm injection (ICSI) treatment a large drop is present between embryo transfer and occurrence of pregnancy. The implantation rate per embryo transferred is only 30%. Studies have shown that minor intrauterine abnormalities can be found in 11–45% of infertile women with a normal transvaginal sonography or hysterosalpingography. Two randomised controlled trials have indicated that detection and treatment of these abnormalities by office hysteroscopy after two failed IVF cycles leads to a 9–13% increase in pregnancy rate. Therefore, screening of all infertile women for intracavitary pathology prior to the start of IVF/ICSI is increasingly advocated. In absence of a scientific basis for such a policy, this study will assess the effects and costs of screening for and treatment of unsuspected intrauterine abnormalities by routine office hysteroscopy, with or without saline infusion sonography (SIS), prior to a first IVF/ICSI cycle.Methods/designMulticenter randomised controlled trial in asymptomatic subfertile women, indicated for a first IVF/ICSI treatment cycle, with normal findings at transvaginal sonography. Women with recurrent miscarriages, prior hysteroscopy treatment and intermenstrual blood loss will not be included. Participants will be randomised for a routine fertility work-up with additional (SIS and) hysteroscopy with on-the-spot-treatment of predefined intrauterine abnormalities versus the regular fertility work-up without additional diagnostic tests. The primary study outcome is the cumulative ongoing pregnancy rate resulting in live birth achieved within 18 months of IVF/ICSI treatment after randomisation. Secondary study outcome parameters are the cumulative implantation rate; cumulative miscarriage rate; patient preference and patient tolerance of a SIS and hysteroscopy procedure. All data will be analysed according to the intention-to-treat principle, using univariate and multivariate logistic regression and cox regression. Cost-effectiveness analysis will be performed to evaluate the costs of the additional tests as routine procedure. In total 700 patients will be included in this study.DiscussionThe results of this study will help to clarify the significance of hysteroscopy prior to IVF treatment.Trial registrationNCT01242852


Orphanet Journal of Rare Diseases | 2013

Fertility preservation in female classic galactosemia patients.

Britt van Erven; Cynthia S. Gubbels; Ron van Golde; Gerard A.J. Dunselman; Josien G. Derhaag; Guido de Wert; Joep Geraedts; Annet M. Bosch; Eileen P. Treacy; Corrine K. Welt; Gerard T. Berry; M. Estela Rubio-Gozalbo

Almost every female classic galactosemia patient develops primary ovarian insufficiency (POI) as a diet-independent complication of the disease. This is a major concern for patients and their parents, and physicians are often asked about possible options to preserve fertility. Unfortunately, there are no recommendations on fertility preservation in this group. The unique pathophysiology of classic galactosemia with a severely reduced follicle pool at an early age requires an adjusted approach. In this article recommendations for physicians based on current knowledge concerning galactosemia and fertility preservation are made. Fertility preservation is only likely to be successful in very young prepubertal patients. In this group, cryopreservation of ovarian tissue is currently the only available technique. However, this technique is not ready for clinical application, it is considered experimental and reduces the ovarian reserve. Fertility preservation at an early age also raises ethical questions that should be taken into account. In addition, spontaneous conception despite POI is well described in classic galactosemia. The uncertainty surrounding fertility preservation and the significant chance of spontaneous pregnancy warrant counseling towards conservative application of these techniques. We propose that fertility preservation should only be offered with appropriate institutional research ethics approval to classic galactosemia girls at a young prepubertal age.


The New England Journal of Medicine | 2017

Oil-Based or Water-Based Contrast for Hysterosalpingography in Infertile Women

K. Dreyer; Joukje van Rijswijk; Velja Mijatovic; M. Goddijn; Harold R. Verhoeve; Ilse A.J. van Rooij; Annemieke Hoek; Petra Bourdrez; Annemiek W. Nap; Henrike G.M. Rijnsaardt-Lukassen; Catharina C.M. Timmerman; Mesrure Kaplan; Angelo B. Hooker; Anna P. Gijsen; Ron van Golde; Cathelijne F. van Heteren; Alexander Sluijmer; Jan-Peter de Bruin; J.M.J. Smeenk; Jacoba A. M. de Boer; Eduard Scheenjes; Annette E.J. Duijn; Alexander Mozes; Mj Pelinck; Maaike Traas; Machiel H.A. van Hooff; Gijsbertus A. van Unnik; Cornelia H. de Koning; Nan van Geloven; Jos W. R. Twisk

BACKGROUND Pregnancy rates among infertile women have been reported to increase after hysterosalpingography, but it is unclear whether the type of contrast medium used (oil‐based or water‐soluble contrast) influences this potential therapeutic effect. METHODS We performed a multicenter, randomized trial in 27 hospitals in the Netherlands in which infertile women who were undergoing hysterosalpingography were randomly assigned to undergo this procedure with the use of oil‐based or water‐based contrast. Subsequently, couples received expectant management or the women underwent intrauterine insemination. The primary outcome was ongoing pregnancy within 6 months after randomization. Outcomes were analyzed according to the intention‐to‐treat principle. RESULTS A total of 1119 women were randomly assigned to hysterosalpingography with oil contrast (557 women) or water contrast (562 women). A total of 220 of 554 women in the oil group (39.7%) and 161 of 554 women in the water group (29.1%) had an ongoing pregnancy (rate ratio, 1.37; 95% confidence interval [CI], 1.16 to 1.61; P<0.001), and 214 of 552 women in the oil group (38.8%) and 155 of 552 women in the water group (28.1%) had live births (rate ratio, 1.38; 95% CI, 1.17 to 1.64; P<0.001). Rates of adverse events were low and similar in the two groups. CONCLUSIONS Rates of ongoing pregnancy and live births were higher among women who underwent hysterosalpingography with oil contrast than among women who underwent this procedure with water contrast. (Netherlands Trial Register number, NTR3270.)


Fertility and Sterility | 2002

Familial oligoasthenoteratozoospermia: evidence of autosomal dominant inheritance with sex-limited expression

J.H.A.M. Tuerlings; Ron van Golde; Astrid R. Oudakker; Helger G. Yntema; J.A.M. Kremer

OBJECTIVE To report the familial occurrence of severe oligoasthenoteratozoospermia in a man and five male relatives related through their mothers. DESIGN Case report. SETTING University medical center. PATIENT(S) Six affected family members. MAIN OUTCOME MEASURE(S) Blood and semen samples were collected from all affected males and some of their healthy male relatives. Pedigree analysis and exclusion of X-linked disorder were done. RESULT(S) Analysis suggested that familial nonsyndromic male factor infertility was present. CONCLUSION(S) The family described in this report suggests the existence of an autosomal dominant trait of male infertility with sex-limited expression.


Human Reproduction | 2017

Individualized FSH dosing based on ovarian reserve testing in women starting IVF/ICSI : a multicentre trial and cost-effectiveness analysis

Theodora C. van Tilborg; Simone C. Oudshoorn; Marinus J.C. Eijkemans; M.H. Mochtar; Ron van Golde; Annemieke Hoek; Walter K. H. Kuchenbecker; Kathrin Fleischer; Jan Bruin; Henk Groen; Madelon van Wely; Cornelis B. Lambalk; Joop S.E. Laven; Ben Willem J. Mol; Frank J. Broekmans; Helen L. Torrance

STUDY QUESTION Is there a difference in live birth rate and/or cost-effectiveness between antral follicle count (AFC)-based individualized FSH dosing or standard FSH dosing in women starting IVF or ICSI treatment? SUMMARY ANSWER In women initiating IVF/ICSI, AFC-based individualized FSH dosing does not improve live birth rates or reduce costs as compared to a standard FSH dose. WHAT IS KNOWN ALREADY In IVF or ICSI, ovarian reserve testing is often used to adjust the FSH dose in order to normalize ovarian response and optimize live birth rates. However, no robust evidence for the (cost-)effectiveness of this practice exists. STUDY DESIGN, SIZE, DURATION Between May 2011 and May 2014 we performed a multicentre prospective cohort study with two embedded RCTs in women scheduled for IVF/ICSI. Based on the AFC, women entered into one of the two RCTs (RCT1: AFC < 11; RCT2: AFC > 15) or the cohort (AFC 11-15). The primary outcome was ongoing pregnancy achieved within 18 months after randomization resulting in a live birth (delivery of at least one live foetus after 24 weeks of gestation). Data from the cohort with weight 0.5 were combined with both RCTs in order to conduct a strategy analysis. Potential half-integer numbers were rounded up. Differences in costs and effects between the two treatment strategies were compared by bootstrapping. PARTICIPANTS/MATERIALS, SETTING, METHODS In both RCTs women were randomized to an individualized (RCT1:450/225 IU, RCT2:100 IU) or standard FSH dose (150 IU). Women in the cohort all received the standard dose (150 IU). Anti-Müllerian hormone (AMH) was measured to assess AMH post-hoc as a biomarker to individualize treatment. For RCT1 dose adjustment was allowed in subsequent cycles based on pre-specified criteria in the standard group only. For RCT2 dose adjustment was allowed in subsequent cycles in both groups. Both effectiveness and cost-effectiveness of the strategies were evaluated from an intention-to-treat perspective. MAIN RESULTS AND THE ROLE OF CHANCE We included 1515 women, of whom 483 (31.9%) entered the cohort, 511 (33.7%) RCT1 and 521 (34.4%) RCT2. Live births occurred in 420/747 (56.3%) women in the individualized strategy and 447/769 (58.2%) women in the standard strategy (risk difference -0.019 (95% CI, -0.06 to 0.02), P = 0.39; a total of 1516 women due to rounding up the half integer numbers). The individualized strategy was more expensive (delta costs/woman = €275 (95% CI, 40 to 499)). Individualized dosing reduced the occurrence of mild and moderate ovarian hyperstimulation syndrome (OHSS) and subsequently the costs for management of these OHSS categories (costs saved/woman were €35). The analysis based on AMH as a tool for dose individualization suggested comparable results. LIMITATIONS, REASONS FOR CAUTION Despite a training programme, the AFC might have suffered from inter-observer variation. In addition, although strict cancel criteria were provided, selective cancelling in the individualized dose group (for poor response in particular) cannot be excluded as observers were not blinded for the FSH dose and small dose adjustments were allowed in subsequent cycles. However, as both first cycle live birth rates and cumulative live birth rates show no difference between strategies, the open design probably did not mask a potential benefit for the individualized group. Despite increasing consensus on using GnRH antagonist co-treatment in women predicted for a hyper response in particular, GnRH agonists were used in almost 80% of the women in this study. Hence, in those women, the AFC and bloodsampling for the post-hoc AMH analysis were performed during pituitary suppression. As the correlation between AFC and ovarian response is not compromised during GnRH agonist use, this will probably not have influenced classification of response. WIDER IMPLICATIONS OF THE FINDINGS Individualized FSH dosing for the IVF/ICSI population as a whole should not be pursued as it does not improve live birth rates and it increases costs. Women scheduled for IVF/ICSI with a regular menstrual cycle are therefore recommended a standard FSH starting dose of 150 IU per day. Still, safety management by individualized dosing in predicted hyper responders is open for further research. STUDY FUNDING/COMPETING INTEREST(S) This study was funded by The Netherlands Organisation for Health Research and Development (ZonMW number 171102020). AMH measurements were performed free of charge by Roche Diagnostics. TCT, HLT and SCO received an unrestricted personal grant from Merck BV. AH declares that the department of Obstetrics and Gynecology, University Medical Centre Groningen receives an unrestricted research grant from Ferring pharmaceutics BV, The Netherlands. CBL receives grants from Merck, Ferring and Guerbet. BWJM is supported by a NHMRC Practitioner Fellowship (GNT1082548) and reports consultancy for OvsEva, Merck and Guerbet. FJMB receives monetary compensation as a member of the external advisory board for Ferring pharmaceutics BV (the Netherlands) and Merck Serono (the Netherlands) for consultancy work for Gedeon Richter (Belgium) and Roche Diagnostics on automated AMH assay development (Switzerland) and for a research cooperation with Ansh Labs (USA). All other autors have nothing to declare. TRIAL REGISTRATION NUMBER Registered at the ICMJE-recognized Dutch Trial Registry (www.trialregister.nl). Registration number: NTR2657.


Oncotarget | 2017

The correlation of age with chemotherapy-induced ovarian function failure in breast cancer patients

Ingeborg J.H. Vriens; Ashley J.R. De Bie; Maureen J. Aarts; Maaike de Boer; Irene Van Hellemond; Joyce H.E. Roijen; Ron van Golde; Adri C. Voogd; Vivianne C. G. Tjan-Heijnen

Purpose To assess the incidence of chemotherapy-induced ovarian function failure (COFF) based on estradiol and follicle stimulating hormone (FSH) monitoring in premenopausal women with hormone-receptor positive breast cancer treated with second and third generation (neo-)adjuvant chemotherapy. Results We identified 115 eligible women. Two years after start of chemotherapy, COFF was significantly more often present in women ≥ 40 years (85.6%) as compared to women < 40 years (8.7%). Only age was significantly associated with COFF two years after start of chemotherapy (HR 12.26; 95% CI 5.21–28.86). In 50% of the patients, premenopausal hormone levels were the first or only evidence of ovarian function recovery (OFR). Materials and Methods We included all premenopausal women with hormone-receptor positive breast cancer treated with anthracycline-based chemotherapy, with or without taxanes, in our university hospital in the Netherlands in the years 2005-2013. Patients were 3-monthly monitored for ovarian function. Cox proportional hazards model was used to determine the predictive impact of various parameters on the occurrence of COFF. Conclusions After second- or third generation (neo-)adjuvant chemotherapy, COFF was still present in 8.7% of patients < 40 years after two years. FSH and estradiol monitoring may be relevant for those in whom ovarian function suppression is considered an additional effective endocrine treatment.

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J.A.M. Kremer

Radboud University Nijmegen

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Annemieke Hoek

University Medical Center Groningen

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Didi D.M. Braat

Radboud University Nijmegen

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Walter K. H. Kuchenbecker

University Medical Center Groningen

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Joop S.E. Laven

Erasmus University Rotterdam

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Cornelis B. Lambalk

VU University Medical Center

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Henk Groen

University Medical Center Groningen

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