[1] Mil Med Ctr, Dept Dermatovenereol, Belgrade 11070, Serbia
[2] Univ Belgrade, Fac Med, Inst Epidemiol, Belgrade, Serbia
[3] Univ Belgrade, Fac Med, Belgrade, Serbia
[4] Clin Ctr Serbia, Clin Dermatovenereol, Belgrade, Serbia
[5] Univ Belgrade, Fac Med, Inst Med Stat & Informat, Belgrade, Serbia
[6] Univ Belgrade, Fac Med, Inst Social Med, Belgrade, Serbia
[7] Clin Ctr Serbia, Clin Phys & Rehabil Med, Belgrade, Serbia