1. Department of Child, Family, and Population Health Nursing University of Washington Seattle Washington USA
2. Department of Epidemiology and Biostatistics University of California San Francisco California USA
3. Department of Obstetrics, Gynecology, & Reproductive Sciences University of California San Francisco California USA
4. Alameda County Perinatal Equity Initiative Alameda County Public Health Department Oakland California USA
5. California Preterm Birth Initiative University of California San Francisco California USA