About the Authors

Shelley N. Facente

shelley@facenteconsulting.com

Current address: Facente Consulting, Richmond, California, United States of America

Affiliation HIV Prevention Section, San Francisco Department of Public Health, San Francisco, California, United States of America

Teri Dowling

Affiliation HIV Prevention Section, San Francisco Department of Public Health, San Francisco, California, United States of America

Eric Vittinghoff

Affiliation Division of Biostatistics, University of California San Francisco, San Francisco, California, United States of America

Deanna L. Sykes

Affiliation Office of AIDS, Center for Infectious Diseases, California Department of Public Health, Sacramento, California, United States of America

Grant N. Colfax

Affiliation HIV Prevention Section, San Francisco Department of Public Health, San Francisco, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SNF TD EV GC. Analyzed the data: SNF TD EV GC. Contributed reagents/materials/analysis tools: EV DLS GC. Wrote the paper: SNF EV. Gathered and prepared data for analysis: SNF. Statistical analysis: EV.