1. Colorectal Unit; Department of General Surgery; Hospital La Fe; University of Valencia; Valencia Spain
2. Colorectal Unit; Department of General Surgery; Complejo Hospitalario Universitario de Ourense; Ourense Spain
3. Spanish Association of Coloproctology (AECP); Bellvitge University Hospital and Valle de Hebron University Hospital; Barcelona Spain
4. Department of Colorectal Surgery; Digestive Disease Institute; Cleveland Clinic; Cleveland Ohio USA