Tze Chao Wee1, Romesh Markus1, Neil G Simon2. 1. From the Department of Rehabilitation Medicine (T.C.W.), Changi General Hospital, Singapore; and the Department of Neurology (R.M., N.S.), St Vincent's Hospital, Darlinghurst, New South Wales, Australia. 2. From the Department of Rehabilitation Medicine (T.C.W.), Changi General Hospital, Singapore; and the Department of Neurology (R.M., N.S.), St Vincent's Hospital, Darlinghurst, New South Wales, Australia. n.simon@unsw.edu.au.