1. Division of Gynecologic Oncology, Department of Obstetrics, Gynecology and Reproductive Biology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
2. Department of Obstetrics and Gynecology, Massachusetts General Hospital, Boston, Massachusetts, USA.
3. Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts, USA.
4. Division of Gynecologic Oncology, Dana Farber Cancer Institute, Boston, Massachusetts, USA.