1. Department of Biochemistry , Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute (IIB) Sant Pau , Barcelona , Spain
2. Sant Pau Memory Unit, Department of Neurology , Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute (IIB) Sant Pau , Barcelona , Spain
3. Center of Biomedical Investigation Network for Diabetes and Metabolic Diseases (CIBERDEM) , Madrid , Spain
4. Center of Biomedical Investigation Network for Neurodegenerative Diseases (CIBERNED) , Madrid , Spain
5. Department of Biochemistry and Molecular Biology , Universitat Autònoma de Barcelona , Barcelona , Spain
6. Comisión de Neuroquímica y Enfermedades Neurológicas, Sociedad Española de Medicina de Laboratorio , Barcelona , Spain