1. Fundación Huésped, Buenos Aires, Argentina.
2. Universidad de Palermo, Buenos Aires, Argentina.
3. Department of Medicine, University of British Columbia, Vancouver, BC, Canada.
4. British Columbia Centre for Excellence in HIV/AIDS, St. Paul's Hospital, Vancouver, BC, Canada.
5. Department of Epidemiology, Brown University School of Public Health, Providence, Rhode Island.
6. Asociación de Travestis, Transexuales y Transgéneros de Argentina (A.T.T.T.A.), Buenos Aires, Argentina.