Inclusion Criteria:

- Patients must have documented diagnosis of gastric cancer

- Patients receiving laparoscopic gastric cancer surgery without preoperative evidence
of serosal invasion and distant lymph node metastasis as determined by evaluation of
preoperative CT-scan, upper endoscopy, or endoscopic ultrasound.

- Patients undergoing gastric cancer surgery without plans for combined operations,
such as resection of another organ for another primary disease.

- Patients who have received comprehensive explanation about the planned study,
understand and accept all the terms of the study and willingly give consent to
participate in all the required elements of the study

Exclusion Criteria:

- Patients without mental competence

- Patients who are illiterate

- Patients who are pregnant

- Patients < 20 and > 80 years old