1. Department of Radiology, Seoul National University Hospital, Jongno-gu, The Republic of Korea;
2. Department of Radiology, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, The Republic of Korea;
3. Department of Radiology, Daerim St. Mary’s Hospital, Seoul, The Republic of Korea;
4. Department of Pathology, Seoul National University Hospital, Jongno-gu, The Republic of Korea;
5. Department of Preventive Medicine, Seoul National University, Gwanak-gu, The Republic of Korea;
6. Department of Internal Medicine, Seoul National University Hospital Healthcare System Gangnam Centre, Seoul, The Republic of Korea;
7. Department of Otolaryngology ? Head and Neck Surgery, Seoul National University Hospital, Jongno-gu, The Republic of Korea;
8. Departrment of Internal Medicine, Seoul National University Hospital, Jongno-gu, The Republic of Korea;
9. Department of Otolaryngology ? Head and Neck Surgery, SMG-SNU Boramae Medical Centre, Seoul, The Republic of Korea;
10. Department of Internal Medicine, Chung Ang University Hospital, Seoul, The Republic of Korea;
11. Department of Radiology, Human Medical Imaging and Intervention Centre, Seoul, The Republic of Korea