1. Department of Kinesiology, College for Health, Community, and Policy, University of Texas at San Antonio, San Antonio, Texas, USA.
2. Obstetrics, Austin Regional Clinic, Austin, Texas, USA.
3. Indian Health Services, Obstetrics, Women's Health Department, Claremore, Texas, USA.
4. Foundation for Maternal, Infant, and Lactation Knowledge, San Antonio, Texas, USA.