| Institution: | 1. Department of Internal Medicine, Chung‐Ang University Hospital, Chung‐Ang University College of Medicine, Dongjak‐gu, Seoul, Korea;2. Department of Pathology, Dongnam Institute of Radiological & Medical Sciences, Gijang‐gun, Busan, Korea;3. Department of Internal Medicine, Korea Cancer Center Hospital, Nowon‐gu, Seoul, Korea;4. Department of Pathology, Korea Cancer Center Hospital, Nowon‐gu, Seoul, Korea;5. Otolaryngology‐Head and Neck Surgery, Korea Cancer Center Hospital, Nowon‐gu, Seoul, Korea;6. Department of Pathology, Seoul National University Boramae Medical Center, Dongjak‐gu, Seoul, Korea;7. Department of Internal Medicine, Seoul National University Boramae Medical Center, Dongjak‐gu, Seoul, Korea;8. Department of Internal Medicine, Seoul National University College of Medicine, Chongno‐gu, Seoul, Korea |
