1. Genetic Medicine Department and Pediatric Institute of Rare DiseasesSant Joan de Déu Hospital Research Institute Barcelona Spain
2. Neuropsychology Unit, Neuroesplugues, Esplugues de Llobregat Barcelona Spain
3. Statistics DepartmentSant Joan de Déu Foundation Barcelona Spain
4. Neuropediatric DepartmentSant Joan de Déu Hospital Research Institute Barcelona Spain
5. Hematology LaboratorySant Joan de Déu Hospital Research Institute Barcelona Spain
6. Nephrology DepartmentSant Joan de Déu Hospital Research Institute Barcelona Spain
7. Hematology and Medical Oncology ServiceMorales Meseguer University Hospital, Regional Blood Donation Center, Murcia University, IMIB‐Arrixaca, U‐765, Center for Biomedical Research on Rare Diseases Murcia Spain
8. Clinical Biochemistry DepartmentSant Joan de Déu Hospital Research Institute Barcelona Spain
9. U‐703, Center for Biomedical Research on Rare DiseasesInstituto de Salud Carlos III, Sant Joan de Déu Hospital Barcelona Spain
10. Diagnosis of Molecular Diseases CenterAutonomous University of Madrid, U‐746, Center for Biomedical Research on Rare Diseases, Instituto de Salud Carlos III, IdiPAZ Madrid Spain
11. Center for Metabolic DiseaseUniversity Hospital Gasthuisberg, Catholic University of Leuven Leuven Belgium