1. Department of Otolaryngology, Taipei City Hospital, Taipei, Taiwan
2. Department of Teaching and Research, Taipei City Hospital, Taipei, Taiwan3Department of Public Health, Institute of Public Health, National Yang-Ming University, Taipei, Taiwan
3. Department of Otolaryngology, College of Medicine, Taipei Medical University, Taipei, Taiwan5Department of Otolaryngology, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan
4. Department of Otolaryngology, Taipei City Hospital, Taipei, Taiwan4Department of Otolaryngology, College of Medicine, Taipei Medical University, Taipei, Taiwan