Chao-Yin Kuo1, Chih-Hung Wang2. 1. Department of Otorhinolaryngology-Head and Neck Surgery (Kuo, Wang), Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan; Graduate Institute of Medical Sciences (Wang), National Defense Medical Center, Taipei, Taiwan. 2. Department of Otorhinolaryngology-Head and Neck Surgery (Kuo, Wang), Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan; Graduate Institute of Medical Sciences (Wang), National Defense Medical Center, Taipei, Taiwan chw@ms3.hinet.net.