1. Chi Mei Medical Center, Liouying, Tainan, Taiwan
2. Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan
3. Department of Otolaryngology, Chung Shan Medical University Hospital, Taichung, Taiwan
4. Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
5. School of Medicine, Chung Shan Medical University, Taichung, Taiwan