1. Metabolic Research Laboratory (J.G.-A., V.C., B.R., A.R., G.F.), Clínica Universitaria de Navarra, University of Navarra, 31008 Pamplona, Spain
2. Departments of Internal Medicine (I.C.), Clínica Universitaria de Navarra, University of Navarra, 31008 Pamplona, Spain
3. Department of Endocrinology (C.S., J.S., G.F.), Clínica Universitaria de Navarra, University of Navarra, 31008 Pamplona, Spain
4. Department of Surgery (F.R., J.A.C.), Clínica Universitaria de Navarra, University of Navarra, 31008 Pamplona, Spain
5. Department of Biochemistry (C.M., M.J.G.), Clínica Universitaria de Navarra, University of Navarra, 31008 Pamplona, Spain