- Correspondence to Dr Eng-King Tan, Department of Neurology, Singapore General Hospital, Block 1 Level 3, Outram Road, Singapore 169108, Singapore;
- Received 21 April 2017
- Revised 25 May 2017
- Accepted 26 May 2017
- Published in print 7 July 2017.
- Published online 8 July 2017.
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