About the Authors

Lee Warner

To whom correspondence should be addressed. E-mail: dlw7@cdc.gov

Affiliations Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America , Division of Reproductive Health, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America

Jeffrey D Klausner

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

Cornelis A Rietmeijer

Affiliation Denver Department of Public Health, Denver, Colorado, United States of America

C. Kevin Malotte

Affiliation California State University, Long Beach, Long Beach, California, United States of America

Lydia O'Donnell

Affiliation Education Development Center, Inc., Newton, Massachusetts, United States of America

Andrew D Margolis

Affiliation Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America

Gregory L Greenwood

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

Doug Richardson

Affiliation Denver Department of Public Health, Denver, Colorado, United States of America

Shelley Vrungos

Affiliation California State University, Long Beach, Long Beach, California, United States of America

Carl R O'Donnell

Affiliation Education Development Center, Inc., Newton, Massachusetts, United States of America

Craig B Borkowf

Affiliation Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America

for the Safe in the City Study Group

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

All authors participated in the design, implementation, analysis, interpretation of the study, and drafting of the manuscript. All authors have seen and approved the final version. LW, JDK, CAR, CKM, LO, GLG, and CRO contributed to the study design and concept. JDK, CAR, CKM, ADM, GLG, DR, and SV participated in acquisition of data. LW, ADM, and CBB performed the statistical analysis.