1. Department of Otolaryngology; National Taiwan University Hospital; Taipei Taiwan
2. Department of Otolaryngology; Cardinal Tien Hospital; New Taipei Taiwan
3. Department of Otolaryngology-Head and Neck Surgery; Chung Shan Medical University Hospital; Taichung Taiwan
4. Department of Otolaryngology; Taichung Tzu Chi Hospital; Buddhist Tzu Chi Medical Foundation; Taichung Taiwan