1 Department of Epidemiology, Key Populations Program, Center for Public Health and Human Rights, Johns Hopkins Bloomberg School of Public Health, 615 N Wolfe Street E 7133, Baltimore, MD, 21205, USA. jtwahir1@jhmi.edu.
2 Health Development Initiative, Kigali, Rwanda.
3 Department of Epidemiology, Key Populations Program, Center for Public Health and Human Rights, Johns Hopkins Bloomberg School of Public Health, 615 N Wolfe Street E 7133, Baltimore, MD, 21205, USA.
4 School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
5 Emory University School of Medicine, Atlanta, GA, USA.
6 Projet San Francisco, Kigali, Rwanda.
7 Département de Psychiatrie, Service d'addictologie, Hôpitaux Universitaire de Genève, Geneva, Switzerland.
8 School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada.
9 BC Center for Disease Control, Vancouver, BC, Canada.