- Correspondence to Dr Patrick Ip, Department of Paediatrics and Adolescent Medicine, The University of Hong Kong, 1/F, New Clinical Building, Queen Mary Hospital, Hong Kong;
- Received 5 January 2017
- Revised 14 May 2017
- Accepted 16 May 2017
- Published in print 12 July 2017.
- Published online 17 July 2017.
- Published first 29 June 2017.
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