1. Department of Medical PsychologyUniversity Medical Center Hamburg‐Eppendorf Hamburg Germany
2. Department of Pediatric Surgery, Queen Silvia Children's HospitalSahlgrenska University Hospital Gothenburg Sweden
3. Department of Pediatric Surgery, Hannover Medical SchoolAuf der Bult Children's Hospital Hannover Germany
4. Institute of Clinical Sciences, Department of Pediatrics, Gothenburg UniversityThe Queen Silvia Children's Hospital Gothenburg Sweden
5. Institute for Health Services Research in Dermatology and NursingUniversity Medical Center Hamburg‐Eppendorf Hamburg Germany