Authors: Luis Bujanda; Cristina Sarasqueta; Leire Zubiaurre; Angel Cosme; Carmen Muñoz; Araceli Sánchez; Cristina Martín; Llucia Tito; Virginia Piñol; Antoni Castells; Xavier Llor; Rosa M Xicola; Elisenda Pons; Juan Clofent; María L de Castro; Jaime Cuquerella; Enrique Medina; Ana Gutierrez; Juan I Arenas; Rodrigo Jover Journal: Gut Date: 2007-03-30 Impact factor: 23.059