J. Kim, General surgery resident, Seoul National University Hospital, Jongno-gu, Seoul, KOREA (THE REPUBLIC OF)|S. Ryoo, H. Lim, M. Kim, J. Park, S. Jeong, K. Park, General surgery professor, Seoul National University College of Medicine, Seoul, KOREA (THE REPUBLIC OF)|D. Lee, General surgery professor, National Cancer Center, Goyang, Gyeonggi-do, KOREA (THE REPUBLIC OF)|