- Correspondence to Professor T H Lam, Li Ka Shing Faculty of Medicine, Lifestyle and Lifecourse Epidemiology Group, School of Public Health, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong SAR, China;
- Received April 29, 2013
- Revised July 15, 2013
- Accepted July 29, 2013
- First published August 22, 2013.
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