1. Kosin University College of Medicine, Busan, Korea.
2. Department of Otolaryngology-Head and Neck Surgery, Kosin University College of Medicine, Busan, Korea.
3. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
4. Department of Pathology, Kosin University College of Medicine, Busan, Korea.
5. Kosin University Graduate School of Public Health, Busan, Korea.