1. Department of Medicine, Division of Infectious Diseases and Global Public Health, University of California, San Diego, La Jolla, California, USA.
2. Herbert Wertheim School of Public Health and Human Longevity Science, University of California, San Diego, La Jolla, California, USA.
3. Division of Epidemiology and Biostatistics, School of Public Health, San Diego State University, San Diego, California, USA.
4. Clinica Trans, Centro de Servicios SER A.C., Tijuana, Baja California, Mexico.
5. Hospital General de Tijuana, Tijuana, Baja California, Mexico.
6. School of Social Work, San Diego State University, San Diego, California, USA.