1Department of Radiology, Cancer center, Dongnam Institute of Radiological and Medical Science, Busan, Korea.
2Department of Radiology, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
3Department of Otrhinolaryngology-Head and Neck Surgery, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
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