1. Division of Newborn Medicine, Floating Hospital for Children at Tufts Medical Center, Boston, Massachusetts;
2. Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts;
3. School of Medicine, Zhejiang University, Hangzhou, China;
4. Department of Ophthalmology, Children's Hospital and Harvard Medical School, Boston, Massachusetts;
5. Department of Pediatric Pulmonology and Neonatology and
6. Perinatal Neuroepidemiology Unit, Hannover Medical School, Hannover, Germany; and
7. Neuroepidemiology Unit, Department of Neurology, Children's Hospital Boston, Boston, Massachusetts