About the Authors

David P Wilson, Sally M Blower
Department of Biomathematics and UCLA AIDS Institute, School of Medicine, University of California, Los Angeles, California, United States of America

Corresponding Author

sblower@mednet.ucla.edu

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.