Jonathan J Y Ong1, Furene S J Wang2, Yee Cheun Chan2. 1. From the Departments of Neurology (J.J.Y.O., Y.C.C.) and Pediatrics (F.S.J.W.), National University Hospital, Singapore. jonathan_ong@nuhs.edu.sg. 2. From the Departments of Neurology (J.J.Y.O., Y.C.C.) and Pediatrics (F.S.J.W.), National University Hospital, Singapore.