1. Department of Medicine, Division of HIV, Infectious Diseases and Global Medicine, University of California San Francisco, School of Medicine, San Francisco, California, USA;
2. Richard A. and Susan F. Smith Center for Outcomes Research in Cardiology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA;
3. Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA;
4. Center on Substance Use and Health, San Francisco Department of Public Health, San Francisco, California, USA;
5. Department of Epidemiology and Biostatistics, University of California San Francisco, School of Medicine, San Francisco, California, USA;
6. Department of Laboratory Medicine, University of California San Francisco, School of Medicine, San Francisco, California, USA