1. Department of Otolaryngology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan 44033, Republic of Korea
2. Department of Pathology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan 44033, Republic of Korea
3. Department of Otolaryngology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
4. Department of Biochemistry and Molecular Biology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea