1. Department of Obstetrics, Gynecology, and Reproductive Sciences University of Pittsburgh School of Medicine, Magee‐Women's Hospital of the University of Pittsburgh Medical Center Pittsburgh Pennsylvania
2. The Joint Pathology Center Defense Health Agency National Capital Regional Medical Directorate Silver Spring Maryland
3. Department of Pathology Vanderbilt University Medical Center Nashville Tennessee
4. Department of Obstetrics and Gynecology Washington University School of Medicine St Louis Missouri