1. Mucosal Immunology Laboratory, Instituto de Biología y Genética Molecular (IBGM), University of Valladolid-CSIC, Valladolid, Spain
2. Digestive Disease Unit, Hospital Clínico Universitario de Valladolid, Valladolid, Spain
3. Laboratory of Molecular Genetics, Hospital Universitario Rio Hortega, Valladolid, Spain