- Correspondence to Dr Thomas P C Chu, Cancer Survival Group, Department of Non-communicable Disease Epidemiology, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK;
- Received September 22, 2014
- Revised April 29, 2015
- Accepted May 10, 2015
- First published June 4, 2015.
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