1. Department of Otolaryngology, Taichung Veterans General Hospital, Taichung, Taiwan
2. School of Medicine Chung Shan Medical University, Taichung, Taiwan
3. Department of Chinese Medicine, Taichung Veterans General Hospital, Taichung, Taiwan
4. School of Health Policy and Management, Chung Shan Medical University, Taichung, Taiwan
5. Department of Medicine, National Yang-Ming Medical University, Taipei, Taiwan