1. Service de Médecine Infantile 1, Centre de Référence des Maladies Héréditaires du Métabolisme, INSERM U 954, CHU Brabois Enfants, Vandoeuvre les Nancy, France;
2. Beatrix Children's Hospital, University Medical Center of Groningen, University of Groningen, Groningen, Netherlands;
3. Dietetics Department, The Children's Hospital, Birmingham, United Kingdom;
4. Klinik fur Kinder und Jugendmedizin Reutlingen, Reutlingen, Germany;
5. Division of Nutrition and Metabolism, Istanbul Faculty of Medicine, Istanbul University, Children's Hospital, Istanbul, Turkey;
6. Department of Pediatrics, San Paolo Hospital, University of Milan, Milan, Italy;
7. Unidad Enfermendades Metabolicas, Servicio de Pediatria, Hospital Ramon y Cajal, Madrid, Spain;
8. Division of Clinical Chemistry and Biochemistry, University Children's Hospital, Zürich, Switzerland; and
9. Zürich Center for Integrative Human Physiology, Zürich, Switzerland