1. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, South Korea.
2. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, South Korea.
3. Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, South Korea.
4. AIDS Research Institute, Yonsei University College of Medicine, Seoul, South Korea.
5. Infection Control Unit, Yonsei University College of Medicine, Seoul, South Korea.
6. Department of Laboratory Medicine, Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, South Korea.