1. Department of Oncology/Hematology, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, Korea.
2. Department of Oncology/Hematology, Dongguk University Medical Center, Gyeongju, Korea.
3. Department of General Surgery, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, Korea.