The secondary endpoint, which is adverse events related to endoscopic tattooing, such as perforation, abscess formation, peritonitis, post-tattoo fever, post-tattoo abdominal pain, and intraperitoneal spillage of tattooing agent, will be evaluated in autologous blood group. Surgery related complications include peritoneal effusion or abscess formation, hemorrhage (inside abdominal cavity, inside digestive tract), ileus, anastomotic leakage, intestinal fistula, lymphatic leakage, gastroparesis, pancreatitis, lung infection, pleural effusion, urinary tract infection, renal failure, liver failure, cardio-cerebrovascular events (both lower extremities thrombosis, pulmonary embolism, myocardial infarction, arrhythmia, cerebral infarction, etc.), and others. Surgical complications will be evaluated in both groups. Complications will be reported and graded according to the Clavien-Dindo classification of surgical complications.

CONSORT diagram

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