- Correspondence to Sunfang Jiang; and Dr William C W Wong, The Department of Family Medicine and Primary Care, The University of Hong Kong ,Ap Lei Chau Clinic, Ap Lei Chau, Hong Kong, China;
- Received 17 March 2017
- Revised 28 June 2017
- Accepted 27 July 2017
- Published in print 2 September 2017.
- Published first 26 August 2017.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.