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Received: 19.04.2018 Accepted: 28.08.2018 1Bilecik Public Health Laboratory, Department of Medical Biochemistry, Bilecik, Turkey 2Bilecik State Hospital, Department of Endocrinology and Metabolism, Bilecik, Turkey 3Istanbul Medeniyet University Göztepe Training and Research Hospital, Department of Endocrinology and Metabolism, Istanbul, Turkey Corresponding author: Saadet Çelik, Bilecik Public Health Laboratory, Department of Medical Biochemistry, Bilecik, Turkey e-mail: saadetkader@hotmail.com

Seasonal Variability of Serum 25-Hydroxy-Vitamin D Levels in the adult population living in Bilecik Province: A Follow-up Study from Turkey