- Correspondence to Koh Jun Ong, HIV/STI Department, Centre for Infectious Disease Surveillance and Control, National Infection Service, Public Health England, 61 Colindale Avenue, London NW9 5EQ, UK;
- Received February 24, 2016
- Revised April 22, 2016
- Accepted May 22, 2016
- First published June 9, 2016.
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