1 Department of Radiation Oncology, Tri-Service General Hospital, National Defense Medical Center, Taiwan.
2 Department of Oncology, Division of Radiation Oncology, National Taiwan University Hospital; Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine; Graduate Institute of Oncology, National Taiwan University College of Medicine, Taipei, Taiwan.
3 Department of Radiation Oncology, Tri-Service General Hospital, National Defense Medical Center, Taiwan; Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan.