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Yahwardiah Siregar

University of North Sumatra

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Bintang Y.M. Sinaga

University of North Sumatra

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Kamal Basri Siregar

University of North Sumatra

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Bahagia Loebis

University of North Sumatra

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Elmeida Effendy

University of North Sumatra

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Herla Rusmarilin

University of North Sumatra

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Muhammad Amin

Airlangga University

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Nurmiati Amir

University of Indonesia

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Siti Syarifah

University of North Sumatra

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Sori Muda Sarumpaet

University of North Sumatra

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Sri Soviani

University of North Sumatra

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