Departments of General Internal Medicine and Obstetrics and Gynecology–Maternal-Fetal Medicine, Center for Healthcare Studies–Institute for Public Health and Medicine and Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
Corresponding author: Lisa M. Masinter, MD, MPH, Postdoctoral Research Fellow, Center for Healthcare Studies, Northwestern University Feinberg School of Medicine, 420 E. Superior Street, 10th Floor, Chicago, IL 60611; e-mail: [email protected].
Supported by an institutional award for postdoctoral training to the Northwestern University Feinberg School of Medicine Center for Healthcare Studies from the Agency for Healthcare Research and Quality, T-32 HS 000078, and by grant number P01HS021141 from the Agency for Healthcare Research and Quality.
The authors thank Jane Holl, MD, MPH, for her editorial assistance and Jungwha Lee, PhD, for her assistance with statistical analysis and variable manipulation.
Presented as a poster at the American College of Obstetricians and Gynecologists Annual Clinical Meeting, April 28, 2014, Chicago, Illinois.
Financial Disclosure The authors did not report any potential conflicts of interest.