1. Department of Pediatrics, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
2. Newborn Care Group at Pennsylvania Hospital, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
3. Center for Preventive Ophthalmology and Biostatistics, Department of Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania
4. Division of Pediatric Ophthalmology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
5. Department of Pediatrics, University of Texas, San Antonio
6. Division of Ambulatory Pediatrics, Nationwide Children’s Hospital, Columbus, Ohio