1. National Evidence-based Healthcare Collaborating Agency, Seoul, Korea.
2. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Family Medicine, Hallym University College of Medicine, Chuncheon, Korea.
5. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
6. Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
7. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
9. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.