Affiliation: | 1. Department of Internal Medicine, Pusan National University Hospital, Busan, Korea;2. Biomedical Research Institute, Pusan National University Hospital, Busan, Korea;3. Department of Internal Medicine, Busan Veterans Hospital, Busan, Korea;4. Department of Otolaryngology, Pusan National University Hospital, Busan, Korea;5. Kim Yong Ki Internal Medicine Clinic, Busan, Korea |