1. From the Division of Neonatology, Department of Pediatrics; Johns Hopkins University School of Medicine, Baltimore, Maryland;
2. Neonatal Unit, University College London Hospitals; London, United Kingdom;
3. Department of Child Health, St George's Hospital Medical School, London, United Kingdom;
4. Great Ormond Street Hospital for Children and the Institute of Child Health, University College London, London, United Kingdom;
5. Newcastle Neonatal Services, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom;
6. Division of Endocrinology, Department of Pediatrics; Brown University School of Medicine; Providence, Rhode Island; and
7. Division of Neonatology, Department of Pediatrics, Case Western Reserve University School of Medicine, Cleveland, Ohio.