1. Department of Obstetrics, Gynecology & Reproductive Sciences, University of California, USA
2. Department of Family Health Care Nursing, University of California, USA
3. Department of Human Ecology, College of Agricultural and Environmental Sciences, University of California, USA
4. California Preterm Birth Initiative, University of California, USA
5. Department of Humanities and Social Sciences, University of California, USA
6. School of Nursing, University of California Los Angeles, USA
7. Child, Family, and Population Health Nursing Department, University of Washington School of Nursing, USA