Yucheng Lu1, Tengchin Wang2, Kuowei Huang3, Chiehjen Wu4. 1. Department of Otolaryngology, National Cheng Kung University Hospital, Tainan City, Taiwan. 2. Department of Otolaryngology, National Cheng Kung University Hospital, Tainan City, Taiwan; Department of Otolaryngology, Tainan Municipal Hospital, Tainan City, Taiwan. Electronic address: tengchin27@hotmail.com. 3. Department of Otolaryngology, Tainan Municipal Hospital, Tainan City, Taiwan. 4. Department of Pathology, Tainan Municipal Hospital, Tainan City, Taiwan.