Randomization is done by person who is not involved in study. So it is done by the person in Center for Clinical Trial in National Cancer Center. The patient is enrolled in the out-patient clinic after getting informed consent of the clinical study from the patient. Surgeon factor is not considered as a randomization factor because this clinical study will be performed intramurally. In Center for Gastric Cancer, National Cancer Center, Surgical techniques and extent of resections are generally standardized and surgical outcomes are same in terms of complication and recovery.