- 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 9 November 2016
- Revised 28 March 2017
- Accepted 18 April 2017
- Published online 11 May 2017.
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