- Correspondence to Dr Wai Keung Leung, Department of Medicine, Queen Mary Hospital, 102 Pokfulam Road, Hong Kong;
- Received 1 June 2017
- Revised 27 August 2017
- Accepted 4 September 2017
- Published in print 1 January 2018.
- Published online 12 December 2017.
- Published first 31 October 2017.
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