1. Department of Obstetrics and Gynecology, School of Medicine, The University of North Carolina at Chapel Hill, Asheville, North Carolina, USA.
2. Division of Pharmaceutical Outcomes and Policy, University of North Carolina Eshelman School of Pharmacy, Chapel Hill, North Carolina, USA.
3. Department of Obstetrics and Gynecology, Mountain Area Health and Education Center, Asheville, North Carolina, USA.