2 Department of Global Health, University of Washington, Seattle, USA. msharma1@uw.edu.
3 International Clinical Research Center (ICRC), Department of Global Health, University of Washington, 908 Jefferson St, Seattle, WA, 98104, USA. msharma1@uw.edu.
4 Department of Medicine, University of Washington, Seattle, USA.
5 Department of Global Health, University of Washington, Seattle, USA.
6 Ministry of Health-National AIDS and STI Control Program, Nairobi, Kenya.
7 Department of Epidemiology, University of Washington, Seattle, USA.