1. Section of General Internal Medicine, Department of Medicine, Boston Medical Center, Chobanian & Avedisian School of Medicine, Boston University, Boston, Massachusetts, USA
2. Boston Healthcare for the Homeless Program, Boston, Massachusetts, USA
3. Section of Infectious Diseases, Department of Medicine, Boston Medical Center, Boston, Massachusetts, USA
4. GenderCare Center, Boston Medical Center, Boston, Massachusetts, USA
5. Tufts University Health Service (Retired), Somerville, Massachusetts, USA
6. Division of Infectious Diseases, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
7. Grayken Center for Addiction, Boston Medical Center, Boston, Massachusetts, USA