Yong Chuan Chee1, Beng Hooi Ong1, Naimah Binti Mohd Saleh1. 1. Department of Internal Medicine (C.Y.C.), Hospital Sultanah Bahiyah; and Department of Internal Medicine (O.B.H., N.B.M.S.), Neurology Unit, Hospital Sultanah Bahiyah, Alor Setar, Kedah, Malaysia.