- 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 March 17, 2017
- Revised June 28, 2017
- Accepted July 27, 2017
- First published August 26, 2017.
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