1. University of Utah Health Salt Lake City Utah USA
2. Intermountain Healthcare Salt Lake City Utah USA
3. Columbia University Medical Center New York New York USA
4. RTI International Research Triangle Park North Carolina USA
5. Department of Obstetrics and Gynecology Columbia University New York New York USA
6. Division of Perinatal Pathology Brown University School of Medicine Providence Rhode Island USA
7. Obstetrics, Gynecology & Reproductive Sciences Yale University New Haven Connecticut USA