1. Department of Biochemistry and Molecular Biology University of the Basque Country Leioa 48940 Spain
2. Biocruces Bizkaia Health Research Institute Barakaldo 48903 Spain
3. Biodonostia Health Research Institute Gastrointestinal Genetics Group San Sebastián 20014 Spain
4. Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd) Barcelona 08036 Spain
5. Department of Genetics Physical Anthropology and Animal Physiology University of the Basque Country Leioa 48940 Spain
6. ULB Center for Diabetes Research Université Libre de Bruxelles Brussels 1070 Belgium
7. Division of Endocrinology Erasmus Hospital Université Libre de Bruxelles Brussels 1070 Belgium
8. Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM) Instituto de Salud Carlos III Madrid 28029 Spain