1. Department of Medicine, University of California San Diego, San Diego, California, USA
2. Department of Family Medicine and Public Health, University of California San Diego, San Diego, California, USA
3. Department of Health Behavior and Health Education, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA
4. Department of Medicine, Ronald Reagan UCLA Medical Center, University of California Los Angeles, Los Angeles, California, USA
5. Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts, USA
6. Department of Pharmaceutical Sciences, University of Colorado, Denver, Colorado, USA
7. Gilead Sciences, Foster City, California, USA
8. Department of Medicine, Harbor-UCLA Medical Center, Torrance, California, USA
9. Department of Psychiatry, University of California San Diego, San Diego, California, USA