1. Department of Internal Medicine, Kangwon National University Hospital, Chuncheon, Korea.
2. Biostatistics Collaboration Unit, Department of Biomedical Systems Informatics, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Seoul Medical Center, Seoul, Korea.
4. Division of Infectious Diseases, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Division of Infectious Disease, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.