1 Division of General Surgery, Department of Colorectal Surgery, Hospital Universitario Central de Asturias (HUCA), Oviedo, Spain. tamara.diaz.vico@gmail.com.
2 Health Research Institute of the Principality of Asturias (ISPA), Asturias, Spain. tamara.diaz.vico@gmail.com.
3 Division of General Surgery, Department of Colorectal Surgery, Hospital Universitario Central de Asturias (HUCA), Oviedo, Spain.
4 Health Research Institute of the Principality of Asturias (ISPA), Asturias, Spain.
5 Department of Surgery, University of Oviedo, Oviedo, Spain.