1. Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Kyung Hee University School of Medicine, Seoul, Korea.
5. Department of Infectious Diseases, Soon Chun Hyang University Hospital Bucheon, Bucheon, Korea.
6. Department of Internal Medicine, Ajou University College of Medicine, Suwon, Korea.
7. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
8. Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu, Korea.
9. Division of Infectious Diseases, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.