1. Department of Surgery, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Hematology-Oncology, Ehwa Womans University Hospital, Seoul, Korea.
3. Department of Surgery, Kwandong University College of Medicine, Goyang, Korea.
4. Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Surgery, Chungnam National University Hospital, Daejeon, Korea.
6. Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
7. Department of Oncology, University of Ulsan College of Medicine, Seoul, Korea.
8. Department of Surgery, University of Ulsan College of Medicine, Seoul, Korea.