- Correspondence to Victoria Louise Gilbart, HIV & STI Department, Centre for Infectious Disease Surveillance and Control (CIDSC), Public Health England, 61 Colindale Avenue, London NW9 5EQ, UK;
- Received May 28, 2014
- Revised September 26, 2014
- Accepted October 5, 2014
- First published October 28, 2014.
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