Department of Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea. Cancer Research Institute, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea. Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea. Department of Surgery, Ajou University Hospital, Suwon, Gyenggi, Republic of Korea. Department of Surgery, Yonsei University Severance Hospital, Seoul, Republic of Korea. Department of Surgery, Pusan National University Yangsan Hospital, Yangsan, Gyeongsangnam-do, Republic of Korea. Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Gyeongsangnam-do, Republic of Korea. Center for Gastric Center, National Cancer Center, Goyang, Gyeonggi, Republic of Korea. Department of Surgery, Catholic University of Seoul St Mary's Hospital, Seoul, Republic of Korea. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea. Department of Surgery, Chonnam National University College of Medicine, Hwasun, Republic of Korea. Department of Surgery, Gyeongsang National University School of Medicine, Jinju, Republic of Korea.