1. Laparoscopy Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain;
2. Bioengineering and Health Technologies Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain;
3. Department of Surgery, University of Extremadura, Cáceres, Spain;
4. General Surgery Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain