1. Department of Paediatrics I University Children's Hospital Heidelberg Heidelberg Germany
2. Center for Rare Diseases University Hospital Heidelberg Heidelberg Germany
3. Department of Paediatrics, St‐Josef Hospital Bochum and Center for Rare Diseases Ruhr‐University Bochum Bochum Germany
4. Department of Paediatrics, Faculty of Medicine and University Hospital Carl Gustav Carus Technische Universität Dresden Dresden Germany
5. Department of Endocrinology, Diabetology, Metabolism and Clinical Chemistry (Internal Medicine 1) Heidelberg University Hospital Heidelberg Germany