1. Department of Pediatrics, Stanford University, Stanford, California;
2. California Perinatal Quality Care Collaborative, Stanford, California;
3. Sutter Medical Center, Sacramento, California;
4. UCSF Benioff Children's Hospital Oakland, Oakland, California;
5. NorthBay Neonatology Associates, Fairfield, California;
6. Perinatal Research Unit, Kaiser Permanente Northern California, Oakland, California;
7. Rady Children’s Hospital-San Diego, San Diego, California; and
8. California Children’s Services, California Department of Health Care Services, Sacramento, California