1. School of Medicine, University of California San Diego, La Jolla, California, USA.
2. Department of Obstetrics and Gynecology, Penn State Hershey Medical Center, Hershey, Pennsylvania, USA.
3. Department of Radiation Medicine and Applied Sciences, University of California San Diego, La Jolla, California, USA.
4. Department of Obstetrics, Gynecology and Reproductive Sciences, University of California San Diego, La Jolla, California, USA.
5. Moores Cancer Center, University of California San Diego, La Jolla, California, USA.
6. Department of Anthropology and Global Health Program, University of California San Diego, La Jolla, California, USA.