1 Department of General and Digestive Surgery, Bellvitge University Hospital, L'Hospitalet de Llobregat, Barcelona, Spain. Electronic address: domenico@bellvitgehospital.cat.
2 Department of General and Digestive Surgery, Bellvitge University Hospital, L'Hospitalet de Llobregat, Barcelona, Spain.
3 Department of Pathology, Bellvitge University Hospital, L'Hospitalet de Llobregat, Barcelona, Spain.