[1] Gen Hosp Valjevo, Dept Surg, Valjevo, Serbia
[2] Clin Ctr Serbia, Inst Endocrinol Diabet & Metab Dis, Ctr Endocrine Surg, Belgrade, Serbia
[3] Univ Clin Ctr Vojvodina, Dept Pulmonol, Novi Sad, Serbia
[4] Univ Kragujevac, Fac Med Sci, Dept Surg, Kragujevac, Serbia
[5] Gen Hosp Valjevo, Dept Surg, Obrena Nikol 5, Valjevo 14000, Serbia