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Dive into the research topics where John Matelski is active.

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Featured researches published by John Matelski.


International Journal of Drug Policy | 2017

Understanding real-world adherence in the directly acting antiviral era: A prospective evaluation of adherence among people with a history of drug use at a community-based program in Toronto, Canada

Kate Mason; Zoë Dodd; Mary Guyton; Paula Tookey; Bernadette Lettner; John Matelski; Sanjeev Sockalingam; Jason Altenberg; Jeff Powis

BACKGROUND Direct acting antiviral (DAA) treatments for Hepatitis C (HCV) are now widely available with sustained virologic response (SVR) rates of >90%. A major predictor of response to DAAs is adherence, yet few real-world studies evaluating adherence among marginalized people who use drugs and/or alcohol exist. This study evaluates patterns and factors associated with non-adherence among marginalized people with a history of drug use who were receiving care through a primary care, community-based HCV treatment program where opiate substitution is not offered on-site. METHODS Prospective evaluation of chronic HCV patients initiating DAA treatment. Self-report medication adherence questionnaires were completed weekly. Pre/post treatment questionnaires examined socio-demographics, program engagement and substance use. Missing adherence data was counted as a missed dose. RESULTS Of the 74 participants, who initiated treatment, 76% were male, the average age was 54 years, 69% reported income from disability benefits, 30% did not have stable housing and only 24% received opiate substitution therapy. Substance use was common in the month prior to treatment initiation with, 11% reported injection drug use, 30% reported non-injection drug use and 18% moderate to heavy alcohol use. The majority (85%) were treatment naïve, with 76% receiving sofosbuvir/ledipasvir (8-24 weeks) and 22% Sofosbuvir/Ribarvin (12-24 weeks). The intention to treat proportion with SVR12 was 87% (60/69). In a modified ITT analysis (excluding those with undetectable RNA at end of treatment), 91% (60/66) achieved SVR12. Overall, 89% of treatment weeks had no missed doses. 41% of participants had at least one missed dose. In multivariate analysis the only factor independently associated with weeks with missed doses was moderate to heavy alcohol use (p=0.05). CONCLUSION This study demonstrates that strong adherence and SVR with DAAs is achievable, with appropriate supports, even in the context of substance use, and complex health/social issues.


BMJ | 2017

Payments by US pharmaceutical and medical device manufacturers to US medical journal editors: retrospective observational study

Jessica Liu; Chaim M. Bell; John Matelski; Peter Cram

Objective To estimate financial payments from industry to US journal editors. Design Retrospective observational study. Setting 52 influential (high impact factor for their specialty) US medical journals from 26 specialties and US Open Payments database, 2014. Participants 713 editors at the associate level and above identified from each journal’s online masthead. Main outcome measures All general payments (eg, personal income) and research related payments from pharmaceutical and medical device manufacturers to eligible physicians in 2014. Percentages of editors receiving payments and the magnitude of such payments were compared across journals and by specialty. Journal websites were also reviewed to determine if conflict of interest policies for editors were readily accessible. Results Of 713 eligible editors, 361 (50.6%) received some (>


Academic Medicine | 2017

The Characteristics of International Medical Graduates Who Have Been Disciplined by Professional Regulatory Colleges in Canada: A Retrospective Cohort Study.

Asim Alam; John Matelski; Hanna R. Goldberg; Jessica Liu; Jason Klemensberg; Chaim M. Bell

0) general payments in 2014, and 139 (19.5%) received research payments. The median general payment was


Medicine | 2015

Characteristics of Internal Medicine Physicians Disciplined by Professional Colleges in Canada.

Jessica Liu; Asim Alam; Hanna R. Goldberg; John Matelski; Chaim M. Bell

11 (£8; €9) (interquartile range


Circulation-cardiovascular Quality and Outcomes | 2016

Association Between Online Physician Ratings and Cardiac Surgery Mortality.

Jessica Liu; John Matelski; Peter Cram; David R. Urbach; Chaim M. Bell

0-2923) and the median research payment was


Journal of Orthopaedic Trauma | 2016

Impact of an Integrated Hip Fracture Inpatient Program on Length of Stay and Costs

Christine Soong; Peter Cram; Ksenia Chezar; Faiqa Tajammal; Kathleen Exconde; John Matelski; Samir K. Sinha; Howard Abrams; Christopher Fan-Lun; Christina Fabbruzzo-Cota; David Backstein; Chaim M. Bell

0 (


Clinical Orthopaedics and Related Research | 2018

Can Patient Selection Explain the Obesity Paradox in Orthopaedic Hip Surgery? An Analysis of the ACS-NSQIP Registry

Joyce C. Zhang; John Matelski; Rajiv Gandhi; Timothy Jackson; David R. Urbach; Peter Cram

0-0). The mean general payment was


JAMA Internal Medicine | 2018

Changes in Ability of Hospitals to Provide Pricing for Total Hip Arthroplasty From 2012 to 2016

Safiyyah Mahomed; Jaime Rosenthal; John Matelski; Peter Cram

28 136 (SD


The Joint Commission Journal on Quality and Patient Safety | 2018

The Characteristics of Physicians Who are Re-Disciplined by Medical Boards: A Retrospective Cohort Study

Thurarshen Jeyalingam; John Matelski; Asim Alam; Jessica Liu; Hanna R. Goldberg; Jason Klemensberg; Chaim M. Bell

415 045), and the mean research payment was


Arthritis & Rheumatism | 2018

Utilization and Short-Term Outcomes of Primary Total Hip and Knee Arthroplasty in the United States and Canada: An Analysis of New York and Ontario Administrative Data

Peter Cram; Bruce E. Landon; John Matelski; Vicki Ling; Therese A. Stukel; J. Michael Paterson; Rajiv Gandhi; Gillian Hawker; Bheeshma Ravi

37 963 (SD

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Asim Alam

University of Toronto

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