1. Department of Internal Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun, Jeonnam 58128, Republic of Korea
2. Department of Otorhinolaryngology‑Head and Neck Surgery, Chonnam National University Medical School and Hwasun Hospital, Hwasun, Jeonnam 58128, Republic of Korea
3. Department of Pathology, Chonnam National University Medical School and Hwasun Hospital, Hwasun, Jeonnam 58128, Republic of Korea
4. Department of Internal Medicine, Chonnam National University Medical School and Hwasun Hospital, Hwasun, Jeonnam 58128, Republic of Kore