1Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
2Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
3Department of Internal Medicine, National Cancer Center, Goyang, Korea.
4Department of Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
5Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
6Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
7Department of Otorhinolaryngology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
8Department of Radiology, National Cancer Center, Goyang, Korea.
9Department of Otorhinolaryngology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
10Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
11Department of Otorhinolaryngology, National Cancer Center, Goyang, Korea.
12Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.
13Department of Biomedical Science, Seoul National University College of Medicine, Seoul, Korea.
14Cancer Research Institute, Seoul National University, Seoul, Korea.
15Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.
16Director General, Korea National Institute of Health, Cheongju, Korea.
Corresponding author: Young Joo Park. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul 03080, Korea. Tel: +82-2-2072-4183, Fax: +82-2-764-2199,
yjparkmd@snu.ac.kr
*These authors contributed equally to this work.