1. Division of Neonatology and Pediatric Intensive Care Medicine, Department of Pediatric and Adolescent Medicine, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
2. Unit of Pediatric Oncology and Pediatric Surgery, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
3. Department of Pediatric Surgery, Karolinska University Hospital, Astrid Lindgren Children's Hospital, Stockholm, Sweden