1 General Hospital Djordje Joanovic, Zrenjanin, Serbia.
2 Neurology Clinic, Clinical Center of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia.
3 Cardiology Clinic, Clinical Center of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia.
4 Mother and Child Health Care Institute, Belgrade, Serbia.
5 Neurology Clinic, Clinical Center of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia. Electronic address: viwdosava_r@yahoo.co.uk.