1. Public Health Consortium of Aljarafe, Hospital San Juan de Dios, Bormujos, Sevilla, Spain.
2. Department of General Surgery, Hospital Virgen del Camino, Sanlúcar de Barrameda, Cadiz, Spain.
3. Department of Laparoscopic Surgery, Minimally Invasive Surgery Centre Jesús Usón, Cáceres, Cáceres, Spain.