1. Centro de Biología Molecular Severo Ochoa UAM-CSIC, Centro de Diagnóstico de Enfermedades Moleculares (CEDEM), CIBERER, IdiPaz, Universidad Autónoma de Madrid, Madrid, Spain.
2. Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark.
3. Congenital Metabolic Diseases Unit, Hospital Virgen del Rocio, Sevilla, Spain.
4. Division of Metabolism, University Children's Hospital Zürich, Zürich, Switzerland.