1. Department of Metabolic Diseases, Wilhelmina Children's Hospital Utrecht, University Medical Center Utrecht, Utrecht, The Netherlands
2. Department of Pediatrics, University Hospital Centre Zagreb and University of Zagreb, School of Medicine, Zagreb, Croatia
3. Division of Inherited Metabolic Diseases, Department of Pediatrics, University Hospital of Padua, Padua, Italy
4. Department of Pediatrics, University of Gothenburg, The Queen Silvia's Children Hospital, Gothenburg, Sweden
5. Department of General Pediatrics, Division of Inborn Metabolic Diseases, University Children's Hospital Heidelberg, Heidelberg, Germany
6. Department of Pediatrics, Ege University Faculty of Medicine, Izmir, Turkey
7. Medical Genetics Clinic, Children's University Hospital, Riga, Latvia
8. Department of Pediatric Neurology, Karolinska University Hospital, Stockholm, Sweden
9. Division of Clinical Genetics, Department of Genetics, Kuala Lumpur Hospital, Kuala Lumpur, Malaysia
10. Department of Metabolic Diseases, Children's Memorial Health Institute, Warsaw, Poland
11. Department of Pediatric Neurology, Red Cross War Memorial Children's Hospital and University of Cape Town, South Africa
12. Department of Pediatrics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
13. Birmingham Children's Hospital, Birmingham, United Kingdom
14. Division of Human Genetics, Innsbruck Medical University, Innsbruck, Austria
15. Reference Center for Inborn Errors of Metabolism, Hôpital Robert Debré, APHP, INSERM U1141 and Université Paris-Diderot, Sorbonne Paris Cité, Paris, France
16. Pediatric Neurology and Metabolic Diseases, Universitair Ziekenhuis Brussel (UZ Brussel), Vrije Universiteit Brussel (VUB), Brussels, Belgium
17. Department of Medical Genetics, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
18. Department of Pediatrics, Radboudumc Amalia Children's Hospital, Nijmegen, The Netherlands
19. Hayward Genetics Center and Department of Pediatrics, Tulane University Medical School, New Orleans, LA, United States
20. Department of Anatomy, Radboudumc, Nijmegen, The Netherlands
21. Department of Laboratory Medicine, Laboratory of Genetic, Endocrine and Metabolic Diseases (LGEM), Radboudumc, Nijmegen, The Netherlands
22. Department of Child Neurology, VU University Medical Center, and Neuroscience Campus Amsterdam, Amsterdam, The Netherlands
23. Department of Neurology, Radboudumc, Nijmegen, The Netherlands