1. Perinatal Epidemiology and Health Outcomes Research Unit, Division of Neonatology, Department of Pediatrics, School of Medicine, Stanford University and Lucile Packard Children’s Hospital, Palo Alto, California;
2. Department of Social and Behavioral Sciences, School of Nursing, University of California, San Francisco, San Francisco, California;
3. California Perinatal Quality Care Collaborative, Palo Alto, California;
4. California Maternal Quality Care Collaborative, Palo Alto, California; and
5. University of California, Davis, Davis, California