1 Department of Medicine, Division of HIV, Infectious Diseases and Global Medicine, University of California, San Francisco (UCSF), San Francisco, CA, USA. Monica.Gandhi@ucsf.edu.
2 Departments of Medicine and Public Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
3 Department of Medicine, Division of HIV, Infectious Diseases and Global Medicine, University of California, San Francisco (UCSF), San Francisco, CA, USA.