About the Authors

Antonio Bernabe-Ortiz

antonio.bernabe@upch.pe

Affiliation School of Public Health and Administration, Universidad Peruana Cayetano Heredia, Lima, Peru

Cesar P. Carcamo

Affiliation School of Public Health and Administration, Universidad Peruana Cayetano Heredia, Lima, Peru

John D. Scott

Affiliation Department of Medicine, University of Washington, Seattle, Washington, United States of America

James P. Hughes

Affiliation Center for AIDS and STD, University of Washington, Seattle, Washington, United States of America

Patricia J. Garcia

Affiliation School of Public Health and Administration, Universidad Peruana Cayetano Heredia, Lima, Peru

King K. Holmes

Affiliations Center for AIDS and STD, University of Washington, Seattle, Washington, United States of America, Departments of Global Health and Medicine, University of Washington, Seattle, Washington, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AB-O KKH. Performed the experiments: AB-O CPC PJG KKH. Analyzed the data: AB-O CPC JDS JPH PJG KKH. Contributed reagents/materials/analysis tools: AB-O CPC JDS JPH PJG KKH. Wrote the paper: AB-O CPC JDS JPH PJG KKH. Performed most of the statistical analysis: AB-O KKH. Prepared the draft of the manuscript: AB-O KKH. Designed the survey: CPC. Designed the sampling procedures: CPC. Designed the handheld computer support of the survey: CPC. Contributed to the approach and the drafting of the manuscript: JDS. Conceived, designed and supervised the overall Peru PREVEN project: PJG KKH. Revised the manuscript for important intellectual content: AB-O CPC JDS JPH PJG KH. Gave final approval of the version submitted for publication: AB-O CPC JDS JPH PJG KH.