- Correspondence to Dr Freddy Perez, HIV, Hepatitis, Tuberculosis and Sexually Transmitted Infections Unit, Communicable Diseases and Health Analysis Department, Pan American Health Organization, 525 23rd Street NW, Washington DC 20037-2895, USA;
- Received November 9, 2016
- Revised March 28, 2017
- Accepted April 18, 2017
- First published May 11, 2017.
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