About the Authors

Alicia C. McDonald

Affiliation Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, United States of America

Lynette Denny

Affiliation Department of Obstetrics and Gynaecology, University of Cape Town, Cape Town, South Africa

Chunhui Wang

Affiliation Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America

Wei-Yann Tsai

Affiliation Department of Biostatistics, Mailman School of Public Health, New York, New York, United States of America

Thomas C. Wright Jr

Affiliation Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America

Louise Kuhn

lk24@columbia.edu

Affiliations Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, United States of America, Gertrude H. Sergievsky Center, College of Physicians and Surgeons, Columbia University, New York, New York, United States of America

Competing Interests

Dr. Denny has received honoraria for appearing on speaker forums regarding HPV vaccines for GlaxoSmithKline (Cervarix) and MSD/Merck (Gardasil) and has undertaken other studies funded by these companies. Dr. Denny is not employed by either company, does no consultancy work, has no patents or products in development and has no financial interest in anyway with either company. Dr. Wright is a consultant to Roche Molecular Diagnostics, BD Diagnostics, GenProbe and MSD/Merck (Gardasil) and is on the Speaker's Bureau of Roche Molecular Diagnostics. Dr. Wright is not employed by any of these companies and has no patents or products in development relevant to this study. Drs. McDonald, Wang, Tsai and Kuhn have no competing interests to declare. This does not alter the author's adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: LK TCW LD. Performed the experiments: LD. Analyzed the data: AM LK WYT. Wrote the paper: ACM LD CW WYT TCW LK.