1. Department of Digestive Diseases, Hospital Universitari de Bellvitge, Idibell, Barcelona, Spain
2. Department of Medical Oncology, Institut Català d'Oncologia DiR, Idibell, Barcelona, Spain
3. Department of Digestive Diseases, Hospital de Mataró del Consorci Sanitari del Maresme, Mataró, Spain
4. Department of Surgery, Hospital Universitari de Bellvitge, Idibell, Barcelona, Spain