1. Department of Otolaryngology, Hualien Tzu Chi Hospital, No. 707, Sec. 3, Chung-Yang Road, Hualien 970, Taiwan, Republic of China
2. Department of Radiology, Kaohsiung Veterans General Hospital, No. 386, Ta-Chung 1st Road, Kaohsiung 813, Taiwan, Republic of China
3. Department of Radiology, Kaohsiung Veterans General Hospital, No. 386, Ta-Chung 1st Road, Kaohsiung 813, Taiwan, Republic of China; Department of Medical Imaging and Radiology, Shu-Zen Junior College of Medicine and Management, Kaohsiung, Taiwan, Republic of China; Department of Medical Imaging and Radiology Science, Central Taiwan University of Science and Technology, No.666, Buzih Road, Beitun
4. Department of Medical Imaging and Radiology, Shu-Zen Junior College of Medicine and Management, No. 452, Huanqiu Road, Luzhu District, Kaohsiung City, 821, Taiwan, Republic of China
5. Department of Radiology, Kaohsiung Veterans General Hospital, No. 386, Ta-Chung 1st Road, Kaohsiung 813, Taiwan, Republic of China; Department of Medical Imaging and Radiology, Shu-Zen Junior College of Medicine and Management, Kaohsiung, Taiwan, Republic of China