1. Department of General and Digestive Surgery, Hospital General Universitario Gregorio Marañon, Complutense University of Madrid, Madrid, Spain
2. Transplant and Hepatobiliopancreatic Surgery Unit, Department of General and Digestive Surgery, Hospital General Universitario Gregorio Marañón, Madrid, Spain
3. Department of Medical Oncology, Department of Oncology, Hospital general Universitario Gregorio Marañon, Complutense University of Madrid, Madrid, Spain
4. Department of Radiation Oncology, Department of Oncology, Hospital general Universitario Gregorio Marañon, Complutense University of Madrid, Madrid, Spain