1. Division of Endocrinology and Human Reproduction; Second Department of Obstetrics and Gynecology; Aristotle University of Thessaloniki; Hippokration Hospital; Thessaloniki; Greece
2. Clinic for Endocrinology, Diabetes and Diseases of Metabolism; Faculty of Medicine; University of Belgrade; Belgrade; Serbia
3. First Propedeutic Department of Internal Medicine; Aristotle University of Thessaloniki; AHEPA Hospital; Thessaloniki; Greece