- Correspondence to Dr Shilpa Hakre, Department of Epidemiology and Threat Assessment, US Military HIV Research Program, 6720-A Rockledge Drive, Suite 400, Bethesda, MD 20817, USA;
- Received February 28, 2012
- Revised August 6, 2012
- Accepted August 8, 2012
- First published September 21, 2012.
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