1 Neurology Clinic, University Clinical Center of Serbia, Faculty of Medicine, University of Belgrade, 6, Dr. Subotic Sr. Street, 11 000, Belgrade, Serbia.
2 Institute for Health Protection of Mother and Child of Serbia "Dr. Vukan Cupic", Belgrade, Serbia.
3 Faculty of Medical Sciences, Department of Neurology, University of Kragujevac, Kragujevac, Serbia.
4 Neurology Clinic, Clinical Center of Montenegro, Podgorica, Montenegro.
5 Neurology Clinic, University Clinical Center of Serbia, Faculty of Medicine, University of Belgrade, 6, Dr. Subotic Sr. Street, 11 000, Belgrade, Serbia. ivanabasta@yahoo.com.