1. Department of Radiation Oncology, Tri-Service General Hospital; National Defense Medical Center; Taipei Taiwan
2. Graduate Institute of Clinical Medicine, College of Medicine; Taipei Medical University; Taipei Taiwan
3. Department of Oral and Maxillofacial Surgery, Tri-Service General Hospital; National Defense Medical Center; Taipei Taiwan
4. Department of Otolaryngology - Head and Neck Surgery, Tri-Service General Hospital; National Defense Medical Center; Taipei Taiwan
5. Department of Radiation Oncology, David Geffen School of Medicine; University of California; Los Angeles California
6. Department of Radiation Oncology; Yee Zen General Hospital; Taoyuan Taiwan