- Correspondence to Dr Christopher P L H Chen, Departments of Pharmacology and Psychological Medicine, Memory Aging & Cognition Centre, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore;
- Received 10 October 2017
- Accepted 11 October 2017
- Published in print 31 October 2017.
- Published online 28 November 2017.
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