1. Division of General Surgery, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan
2. School of Medicine, National Yang-Ming University, Taipei, Taiwan
3. Center of Immuno-Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, Taiwan
4. National Yang-Ming University Hospital, Yilan, Taiwan
5. Department of Pathology, Taipei Veterans General Hospital, Taipei, Taiwan