1. Departments of Obstetrics, Pulmonology and Neonatology, and Epidemiology, Social Medicine and Health System Research, Hannover Medical School, Hannover, Germany
2. Center for Quality Assurance and Management in Health Care, Hannover, Germany
3. Children’s Hospital and Harvard School of Public Health, Boston, Massachusetts
4. Departments of Obstetrics and Pediatrics, Perinatal Infectious Disease Epidemiology Unit, Hannover Medical School, Hannover, Germany
5. Neuroepidemiology Unit, Departments of Neurology, Children’s Hospital and Harvard Medical School, Boston, Massachusetts
6. Department of Neonatology, University of Tübingen, Tübingen, Germany