1. Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota, USA.
2. Department of Emergency Medicine, Mayo Clinic, Rochester, Minnesota, USA.
3. Department of Emergency Medicine, Mayo Clinic Health System, Albert Lea and Austin, Minnesota, USA.
4. University of Minnesota School of Public Health, Division of Health Policy and Management, Minneapolis, Minnesota, USA.
5. Division of Neonatal Medicine, Mayo Clinic, Rochester, Minnesota, USA.