1. Division of Metabolism and Children's Research Center; University Children's Hospital; Zurich CH-8032 Switzerland
2. Department of Pediatrics; University Hospital; Münster D-48149 Germany
3. Institute of Inherited Metabolic Disorders; First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague; Prague Czech Republic
4. Klinikum für Kinder- und Jugendmedizin; Klinikum Braunschweig; Braunschweig D-38118 Germany
5. radiz - Rare Disease Initiative Zurich; Clinical Research Priority Program for Rare Diseases, University of Zurich; Switzerland
6. Zurich Center for Integrative Human Physiology; University of Zurich; Switzerland