1. Division of Neonatology, Department of Pediatrics and Adolescent Medicine, University Gießen, Germany
2. Division of Neonatology and Pediatric Critical Care, Department of Pediatrics and Adolescent Medicine, University Ulm, Germany
3. Institute of Epidemiology and Medical Biometry, Universitat Ulm, Ulm, Germany
4. Department of Obstetrics and Gynecology, Universitat Ulm, Ulm, Germany