Affiliation: | (1) Department of Neurology, Medical University of Southern Africa and Ga-Rankuwa Hospital, PO Box 108, Medunsa 0204, South Africa, Tel.: + 27-12-521-41 36/42 09, Fax: + 27-12-521-47 58/560-00 86, ZA;(2) Eugene Marais Hospital, Pretoria, South Africa, ZA;(3) 470 Myburgh Street, Capital Park, Pretoria, South Africa, ZA |