1. Department of Obstetrics and Gynecology, University of Virginia, Charlottesville, VA, USA
2. Department of Obstetrics and Gynecology, University of North Carolina, Charlottesville, VA, USA
3. Department of Obstetrics and Gynecology, Stanford University, Stanford, CA, USA
4. Reproductive Medicine and Surgery Center of Virginia, Charlottesville, VA, USA
5. Pathology Department, University of Virginia, Charlottesville, VA, USA