1. Fran and Earl Ziegler College of Nursing, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
2. Cass Lake Indian Health Service, Cass Lake, Minnesota, USA.
3. Hudson College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
4. Chickasaw Nation Department of Health, Ada, Oklahoma, USA.
5. OB Hospitalist Group, Greenville, South Carolina, USA.
6. Department of Maternal-Fetal Medicine, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
7. Johns Hopkins University School of Nursing, Baltimore, Maryland, USA.