1. Department for Pediatrics, Universitätsklinikum Würzburg, 97070 Würzburg, Bavaria, Germany
2. Department of Pediatrics, University Rostock, 18057 Rostock, Mecklenburg-Vorpommern, Germany
3. Department for Neonatology, Klinikum Südstadt Rostock, 18059 Rostock, Mecklenburg-Vorpommern, Germany