1 Department of Obstetrics and Gynecology, University of Michigan Medical School, Ann Arbor, Michigan.
2 Department of Health Law, Policy and Management, the Department of Community Health Sciences, and the Biostatistics and Epidemiology Data Analytics Center, Boston University School of Public Health, Boston, Massachusetts.
3 Department of Health Policy and Management, Columbia University, Mailman School of Public Health, New York, New York.
4 Division of Health Policy and Management, University of Minnesota School of Public Health, Minneapolis, Minnesota.