- Correspondence to Professor Bernard Cheung, Department of Medicine, University of Hong Kong, Queen Mary Hospital, 102 Pokfulam Road, Hong Kong, Hong Kong;
- Received 26 July 2017
- Revised 11 August 2017
- Accepted 12 August 2017
- Published in print 1 December 2017.
- Published online 24 November 2017.
- Published first 31 August 2017.
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