1. Department of Medicine, Division of Infectious Diseases, Columbia University Irving Medical Center , New York, New York , USA
2. HIV Prevention Program in the Comprehensive Health Program, Ambulatory Care Network West, NewYork-Presbyterian Hospital , New York, New York , USA
3. Columbia University Vagelos College of Physicians and Surgeons , New York, New York , USA
4. Department of Epidemiology, Mailman School of Public Health , New York, New York , USA
5. Geisinger Commonwealth School of Medicine , Scranton, Pennsylvania , USA
6. UCSF School of Medicine , San Francisco, California , USA
7. Wayne State University School of Medicine , Detroit, Michigan , USA
8. Department of Pediatrics, Columbia University Irving Medical Center , New York, New York , USA