1. School of Medicine, University of Minho, 4710-057 Braga, Portugal
2. Torres Vedras’s Hospital, Internship in General Surgery at Braga’s Hospital, 2560-295 Torres Vedras, Portugal
3. Department of General Surgery at Braga’s Hospital, 4710-243 Braga, Portugal
4. Life and Health Science Research Institute (ICVS), School of Medicine, University of Minho, 4710-057, Braga, Portugal
5. Life and Health Sciences Research Institute (ICVS)/3B’s-PT Government Associate Laboratory, 4806-909 Guimarães, Portugal
6. Coloproctology Unit, Braga’s Hospital, 4710-243 Braga, Portugal