1. Department of Epidemiology and Biostatistics, University of California, San Francisco , CA , USA
2. UCSF Library, University of California, San Francisco , CA , USA
3. Division of HIV, Infectious Diseases, and Global Medicine, Zuckerberg San Francisco General Hospital, University of California, San Francisco , California , USA
4. Institute for Global Health Sciences, University of California , San Francisco, CA , USA
5. Francis I. Proctor foundation, University of California , San Francisco , USA
6. San Francisco Veterans Affairs Medical Centre , San Francisco, CA , USA