1. Department of Laboratory Medicine, National Health Insurance Service, Ilsan Hospital, Goyang, Korea
2. Department of Internal Medicine, National Health Insurance Service, Ilsan Hospital, Goyang, Korea
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
4. Research Institute of Bacterial Resistance, Yonsei University College of Medicine, Seoul, Korea
5. Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Korea