1Department of Pathology, Institute for Medical Sciences and Research Institute of Clinical Medicine, Chonbuk National University Medical School, Jeonju, Korea. mws@chonbuk.ac.kr 2Department of Radiology, Institute for Medical Sciences and Research Institute of Clinical Medicine, Chonbuk National University Medical School, Jeonju, Korea. 3Department of Otolaryngology, Institute for Medical Sciences and Research Institute of Clinical Medicine, Chonbuk National University Medical School, Jeonju, Korea.