1. German Paediatric Pain Centre Children's and Adolescents' Hospital Datteln Germany
2. Department of Children's Pain Therapy and Paediatric Palliative Care, Faculty of Health, School of Medicine Witten/Herdecke University Witten Germany
3. Faculty of Business and Health University of Applied Sciences Bielefeld Bielefeld Germany
4. Paediatric Pain Center Baden‐Württemberg, Department of Pediatric Neurology Olgahospital Stuttgart Stuttgart Germany
5. University Children's Hospital Augsburg Swabian Children's Pain Center Augsburg Germany
6. Department of Medicine and Health Services Research BARMER Health Insurance Wuppertal Germany