1. is a third-year maternal-fetal medicine fellow, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania.
2. is a third-year obstetrics and gynecology resident, University of Michigan, Ann Arbor, Michigan.
3. is associate professor of obstetrics and gynecology and associate residency program director, Division of Maternal-Fetal Medicine, University of Washington Medical Center, Seattle, Washington.
4. is assistant professor of obstetrics and gynecology, Division of Maternal-Fetal Medicine, University of Washington Medical Center, Seattle, Washington.
5. is clinical professor of obstetrics and gynecology, Division of Maternal-Fetal Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania.
6. is a third-year maternal-fetal medicine fellow, University of Washington Medical Center, Seattle, Washington.