About the Authors

David P Wilson

Affiliation Department of Biomathematics and UCLA AIDS Institute, School of Medicine, University of California, Los Angeles, California, United States of America

Sally M Blower

To whom correspondence should be addressed. E-mail: sblower@mednet.ucla.edu

Affiliation Department of Biomathematics and UCLA AIDS Institute, School of Medicine, University of California, Los Angeles, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

DPW and SMB designed the study, analyzed the data, and contributed to writing the paper. SMB is a member of the editorial board of PLOS Medicine.