1 Division of HIV, Infectious Diseases and Global Medicine, Department of Medicine, University of California, San Francisco (UCSF), San Francisco, California, USA.
2 Departments of Epidemiology, Infectious Diseases and Microbiology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.
3 Departments of Epidemiology and International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.
4 Division of Infectious Diseases, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.
5 Forum for Collaborative Research, Washington, DC, USA.
6 Weill Cornell Medicine - Division of Infectious Diseases, New York, USA.