About the Authors
Viral Oncology Laboratories, University of Manchester School of Cancer & Enabling Sciences, St Mary's Hospital, Manchester, United Kingdom
Departments of Obstetrics and Gynaecology, University of Nairobi, Nairobi, Kenya
The authors have declared that no competing interests exist.
Conceived and designed the experiments: INH LH XH AO. Performed the experiments: XH TW. Analyzed the data: XH TW. Wrote the paper: LH INH AO TW IOM. Responsible for sample collection: IOM.