Bang Wool Eom1, Jungnam Joo2, Boram Park2, Young-Woo Kim3. 1. Gastric Cancer Branch, Research Institute & Hospital, National Cancer Center, Ilsan-ro 323, Ilsandong-gu, Goyang-si, 410-769, Republic of Korea. 2. Biometric Research Branch, Research Institute for National Cancer Control & Evaluation, National Cancer Center, Ilsan-ro 323, Ilsandong-gu, Goyang-si, 410-769, Republic of Korea. 3. Gastric Cancer Branch, Research Institute & Hospital, National Cancer Center, Ilsan-ro 323, Ilsandong-gu, Goyang-si, 410-769, Republic of Korea. Electronic address: gskim@ncc.re.kr.