- Correspondence to Dr Lawrence Ka Sing Wong, Department of Medicine & Therapeutics, Prince of Wales Hospital, Shatin, Hong Kong, postal code 999077;
- Received 3 November 2014
- Revised 10 April 2015
- Accepted 13 April 2015
- Published in print 1 May 2016.
- Published online 14 April 2016.
- Published first 30 April 2015.
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