- Correspondence to Dr Ding Ding, Prevention Research Collaboration, Charles Perkins Centre, Sydney School of Public Health, University of Sydney, Camperdown, NSW 2006, Australia;
- Accepted February 25, 2018
- First published May 31, 2018.
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.