1. Division of Endocrinology, Diabetes, and Clinical Nutrition University Hospital Zurich, University of Zurich Zurich Switzerland
2. Department of Clinical Chemistry and Biochemistry University Children's Hospital Zurich, University of Zurich Zurich Switzerland
3. Core Facility Mass Spectrometry Medical University of Graz Graz Austria
4. Division of Pediatric Endocrinology, Diabetology and Metabolism, Department of Pediatrics and Institute of Clinical Chemistry University Hospital Bern, Inselspital Bern Switzerland
5. Department of Pediatrics and Adolescent Medicine Medical University of Graz Graz Austria
6. Division of Metabolism and Children's Research Center (CRC) University Children's Hospital, Zurich, University of Zurich Zurich Switzerland
7. radiz—Rare Disease Initiative Zurich, Clinical Research Priority Program for Rare Diseases University of Zurich Zurich Switzerland
8. Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism Inselspital, Bern University Hospital and University of Bern Bern Switzerland