- Correspondence to Ellen W Wiewel, New York City Department of Health and Mental Hygiene, HIV Epidemiology and Field Services Program, 42-09 28th Street, 22nd Floor, Long Island City, NY 11101, USA;
- Received May 24, 2012
- Revised November 27, 2012
- Accepted December 9, 2012
- First published January 19, 2013.
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