1. Division of Prevention Science, University of California , San Francisco, California , USA
2. Division of HIV, Infectious Diseases, and Global Medicine, University of California , San Francisco, California , USA
3. Department of Epidemiology and Biostatistics, University of California , San Francisco, California , USA
4. Division of Infectious Diseases, University of Alabama at Birmingham , Birmingham, Alabama , USA
5. Division of Allergy and Infectious Diseases, University of Washington , Seattle, Washington , USA
6. Divsion of Infectious Diseases, Case Western Reserve University , Cleveland, Ohio , USA
7. Division of Infectious Diseases, University of California , San Diego, California , USA
8. Department of Medicine, Harvard University , Boston, Massachusetts , USA
9. Division of Infectious Diseases, University of North Carolina , Chapel Hill, North Carolina , USA
10. Division of Infectious Diseases, Johns Hopkins University , Baltimore, Maryland , USA
11. School of Nursing, University of California , San Francisco, California , USA