- Correspondence to Sarah C Woodhall, HIV & STI Department, Public Health England, 61 Colindale Avenue, London NW9 5EQ, UK;
- Received January 16, 2015
- Revised May 29, 2015
- Accepted July 12, 2015
- First published August 19, 2015.
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- Data supplement 1 - Online supplement
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