[1] Univ Belgrade, Sch Med, Dept Neurol, Belgrade, Serbia
[2] Clin Ctr Serbia, Clin Neurol, Belgrade, Serbia
[3] Univ Belgrade, Inst Med Res, Belgrade, Serbia
[4] Univ Belgrade, Sch Med, Belgrade, Serbia
[5] Univ Belgrade, Sch Med, Inst Epidemiol, Belgrade, Serbia