1. Coloproctology Unit; General and Digestive Surgery Department; Parc Taulí University Hospital; Universitat Autònoma de Barcelona; Sabadell Spain
2. Digestive Department; Parc Taulí University Hospital; Universitat Autònoma de Barcelona; Sabadell Spain
3. Pathology Department; Parc Taulí University Hospital; Universitat Autònoma de Barcelona; Sabadell Spain