1. Department of Endocrinology, Clinical Center of Montenegro, Podgorica, Montenegro;
2. Faculty of Medicine, Clinic for Endocrinology, Diabetes and Metabolic Diseases, Clinical Center of Serbia, University of Belgrade, Belgrade, Serbia;
3. Faculty of Medicine, Dom zdravlja Vozdovac, University of Belgrade, Belgrade, Serbia;
4. Faculty of Medicine, Talma Medic, University of Banja Luka, Republic of Srpska, Bosnia