[1] Univ Novi Sad, Med Fac, Clin Ctr Vojvodina, Clin Endocrinol Diabet & Metab Disorders, Novi Sad, Serbia
[2] Aristotle Univ Thessaloniki, Gen Hosp Hippokration, Propedeut Dept Internal Med 2, Thessaloniki, Greece
[3] Aristotle Univ Thessaloniki, Gen Hosp Hippokration, Dept Cardiol 2, Thessaloniki, Greece
[4] Riga Eastern Clin Univ Hosp, Dept Endocrinol, Riga, Latvia
[5] Democritus Univ Thrace, Univ Hosp Alexandroupolis, Diabet Ctr, Dept Internal Med 2, Alexandroupolis, Greece
[6] Univ Palermo, Sch Med, Dept Hlth Promot Mother & Child Care Internal Med, Palermo, Italy