1. Voice Clinic, Department of Otolaryngology, Cheng Hsin General Hospital, Taipei, Taiwan2Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan
2. Voice Clinic, Department of Otolaryngology, Cheng Hsin General Hospital, Taipei, Taiwan
3. Voice Clinic, Department of Otolaryngology, Cheng Hsin General Hospital, Taipei, Taiwan3Department of Otolaryngology, National Yang-Ming University, Taipei, Taiwan