[1
]
Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill
School of Medicine, Chapel Hill, NC. Electronic address: lisa_rahangdale@med.unc.edu.
[2
]
Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill
School of Medicine, Chapel Hill, NC.
[3
]
Department of Biostatistics, University of North Carolina at Chapel Hill School of
Medicine, Chapel Hill, NC.
[4
]
Department of Pathology, University of North Carolina at Chapel Hill School of Medicine,
Chapel Hill, NC.
[5
]
Department of Epidemiology, University of North Carolina Gillings School of Public
Health, Chapel Hill, NC.