1. aSection of Neonatology, Department of Pediatrics, University of Colorado School of Medicine, Children’s Hospital Colorado, Aurora, Colorado
2. bDepartment of Pediatrics, Northwestern University Feinberg School of Medicine, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois
3. cSection of Neonatology, Department of Pediatrics, University of Pennsylvania, the Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
4. dDepartment of Pediatrics, Medical College of Wisconsin, Children’s Wisconsin, Milwaukee, Wisconsin
5. eCook Children’s Medical Center, Fort Worth, Texas
6. fPenn State Health Hampden Medical Center, Enola, Pennsylvania
7. gDivision of Neonatology, Department of Pediatrics, Emory University School of Medicine, Children’s Healthcare of Atlanta at Egleston, Atlanta, Georgia