1. Clínica Universidad de Navarra , Pamplona , Navarra , Spain
2. Service of Biochemistry , Vall d’Hebron University Hospital , Barcelona , Spain
3. Service of Clinical Biochemistry , La Paz University Hospital , Madrid , Spain
4. Service of Clinical Biochemistry , Ramón y Cajal University Hospital , Madrid , Spain
5. Service of Biochemistry and Molecular Genetics , Hospital Clinic Universitari de Barcelona , Barcelona , Spain