[1
]
Department of Obstetrics and Gynecology, University Hospitals Case Medical Center,
MacDonald Women's Hospital, Cleveland, Ohio.
[2
]
Department of Obstetrics and Gynecology, University of North Carolina School of Medicine,
Chapel Hill, North Carolina.
[3
]
Department of Pathology and Laboratory Medicine, NorthShore University HealthSystem,
Evanston, Illinois.
[4
]
Department of Obstetrics and Gynecology, Northwestern University Feinberg School of
Medicine, Chicago, Illinois.