1. Department of Surgery Seoul National University HospitalSeoul National University College of Medicine Seoul Republic of Korea
2. Department of Surgery Samsung Medical CenterSungkyunkwan University School of Medicine Seoul Republic of Korea
3. Department of Surgery School of Medicine Kyungpook National University, Kyungpook, National University Hospital Daegu Republic of Korea
4. Division of Hepatobiliary Surgery and Liver Transplantation Department of Surgery Asan Medical Center University of Ulsan College of Medicine Seoul Republic of Korea
5. Department of Surgery Seoul National University Bundang HospitalSeoul National University College of Medicine Seoul Republic of Korea
6. Department of Surgery, Digestive Disease and Surgery Institute Cleveland Clinic Cleveland OH