1. Gastroenterology and Nutrition Department, Hospital Sant Joan de Déu, 08950 Barcelona, Spain
2. Division of Inborn Errors of Metabolism-IBC, Biochemistry and Molecular Genetics Department, Hospital Clínic de Barcelona, 08036 Barcelona, Spain
3. Clinical Biochemistry Department, Institut de Recerca Sant Joan de Déu, 08950 Barcelona, Spain
4. Genetic Department, Hospital Sant Joan de Déu, 08950 Barcelona, Spain
5. Department of Biochemistry, Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute (IIB) Sant Pau, 08041 Barcelona, Spain
6. Centre of Biomedical Investigation Network for Diabetes and Metabolic Diseases (CIBERDEM), 28029 Madrid, Spain
7. Departamento de Fisiología, Anatomía y Biología Celular, Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide, 41013 Sevilla, Spain
8. U703-U729 CIBERER, Instituto de Salud Carlos III, 28029 Madrid, Spain