
Keywords: موسسه تحقیقات سرطان; Gut; Associated lymphatic tissue; Water; Fasting; Gut morphology; ERAS; GALT; Gut-Associated Lymphoid Tissue; PP; Peyer's Patches; IEL; Lymphocytes in intraepithelial Spaces; LPL; Lymphocytes in lamina Propria; PN; Parenteral Nutrition; EN; Enteral Nutrit