Yun-Ting Chao1, Wing-Yin Li2, Pen-Yuan Chu3. 1. Department of Otolaryngology-Head and Neck Surgery, Taipei Veterans General Hospital, Taipei, Taiwan. 2. Department of Pathology, Taipei Veterans General Hospital, Taipei, Taiwan3Department of Pathology, National Yang-Ming University, School of Medicine, Taipei, Taiwan. 3. Department of Otolaryngology-Head and Neck Surgery, Taipei Veterans General Hospital, Taipei, Taiwan4Department of Otorhinolaryngology, National Yang-Ming University, School of Medicine, Taipei, Taiwan.