1. Perinatal Research Unit, Division of Research, Kaiser Permanente Northern California, Oakland2Department of Pediatrics, University of California, San Francisco3The Permanente Medical Group, Oakland, California
2. Newborn Care at Pennsylvania Hospital, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania5Perelman School of Medicine, University of Pennsylvania, Philadelphia
3. The Permanente Medical Group, Oakland, California
4. Perinatal Research Unit, Division of Research, Kaiser Permanente Northern California, Oakland
5. Department of Pediatrics, University of California, San Francisco
6. Systems Research Initiative, Division of Research, Kaiser Permanente Northern California, Oakland
7. Perinatal Research Unit, Division of Research, Kaiser Permanente Northern California, Oakland3The Permanente Medical Group, Oakland, California6Systems Research Initiative, Division of Research, Kaiser Permanente Northern California, Oakland