Affiliation: | Maria Isabel Prieto-Nieto, Juan Pedro Pérez-Robledo, Beatriz Díaz-San Andrés, José Antonio Rodríguez-Montes, Department of General and Digestive Surgery, La Paz University Hospital, Paseo de la Castellana, 28046 Madrid, Spain;Manuel Nistal, Department of Pathology, La Paz University Hospital, Paseo de la Castellana, 28046 Madrid, Spain |