1. Division of Infectious Diseases, Department of Internal Medicine, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
2. Division of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Asan Institute of Life Sciences, Asan Medical Center, Seoul, Korea.
4. Center for Antimicrobial Resistance and Microbial Genetics, University of Ulsan, Seoul, Korea.