1. Centre for Child and Adolescent Medicine, Division of Neuropaediatrics and Metabolic Medicine, Department of General Paediatrics University Hospital Heidelberg Heidelberg Germany
2. University of Zagreb, School of Medicine and Department of Pediatrics University Hospital Center Zagreb Zagreb Croatia
3. University Children's Hospital and Children's Research Center, University of Zurich Zurich Switzerland
4. Division of Inherited Metabolic Disease University Hospital Padova Padova Italy
5. Children's National Medical Center Washington DC USA
6. Department of Medical Genetics and Pediatrics National Taiwan University Hospital Taipei Taiwan
7. University Hospital Germans Trias i Pujol, Department of Paediatrics, Unit of Inherited Metabolic Diseases and Neuropediatrics Universitat Autònoma de Barcelona Badalona Spain
8. Hôpital Universitaire des Enfants Reine Fabiola‐Université Libre de Bruxelles Brussels Belgium
9. Medical Reference Center for Inherited Metabolic Diseases Jeanne de Flandre University Hospital and RADEME Research Team for Rare Metabolic and Developmental Diseases, CHRU Lille Lille France
10. Department of Pediatric Inherited Metabolic Diseases University Hospital of Antwerp UZA Antwerp Belgium
11. Department of Paediatrics, Division of Paediatric Endocrinology, Diabetology and Metabolism, Inselspital University Hospital Bern Bern Switzerland
12. University Children's Hospital, University Medical Centre Hamburg‐Eppendorf Hamburg Germany
13. Endocrinology and Nutrition Department Hospital Universitari Germans Trias i Pujol Badalona Spain
14. Clinic for Pediatrics Medical University of Innsbruck Innsbruck Austria
15. Goethe University Frankfurt/Main, Uni.‐Children's Hospital Frankfurt/Main Germany
16. Centre Inherited Metabolic Diseases, Departments of Paediatrics and Clinical Genetics Copenhagen University Hospital Copenhagen Denmark
17. Universitätsmedizin Göttingen, Georg‐August‐Universität Göttingen Germany
18. National Hospital for Neurology and Neurosurgery, Charles Dent Metabolic Unit London UK
19. Institute of Pathology and Human Genetics (IPG) Charlerois Belgium
20. Hospital Universitario Son Espases Palma de Mallorca Spain
21. Institouto Ygeias Tou Paidiou, Institute of Child Health Athens Greece
22. Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Centre University of Freiburg, Faculty of Medicine Freiburg Germany
23. Erasmus Medical Center Rotterdam The Netherlands