1. Department of Otolaryngology—Head and Neck Surgery, Soonchunhyang University College of Medicine, Bucheon, Korea.
2. Division of Endocrinology, Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea.
3. Department of Radiology, Ewha Womans University School of Medicine, Seoul, Korea.
4. Department of Otolaryngology—Head and Neck Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.