1. Division of Neonatology and Pediatric Intensive Care, Department of Pediatrics; University of Greifswald; Greifswald Germany
2. Division of Neonatology, Department of Pediatrics; McMaster University; Hamilton Ontario Canada
3. Department of Mathematics and Statistics; McMaster University; Hamilton Ontario Canada
4. Department of Pediatrics; Paracelsus Medical University Nuremberg, Nuremberg General Hospital; Nuremberg Germany