Ji Hoon Kim1,2. 1. Center for Liver and Pancreatobiliary Cancer, National Cancer Center, 323 Ilsan-ro, Ilsandonggu, Goyang-si, Gyeonggi-do, 10408, Republic of Korea. asist10@hanmail.net. 2. Department of Surgery, Eulji University College of Medicine, Daejeon, Republic of Korea. asist10@hanmail.net.