1. Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
2. Department of Obstetrics and Gynecology, John H. Stroger, Jr. Hospital of Cook County, Chicago, Illinois, USA
3. Department of Anthropology, The Graduate School, Northwestern University, Chicago, Illinois, USA
4. Department of Obstetrics and Gynecology, NorthShore University Healthcare System, Evanston, Illinois, USA