Affiliation: | 1. Department of Gastroenterology, Hospital Universitario Araba, Vitoria-Gasteiz, Álava, Spain;2. Department of Pathology, Hospital Universitario Araba, Vitoria-Gasteiz, Álava, Spain;3. Department of Gastroenterology, Hospital Vithas San José, Vitoria-Gasteiz, Álava, Spain |