1. Department of Internal Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
2. Infection Control Center, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
3. Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
4. Department of Pathology, National Cheng Kung University Hospital, Tainan, Taiwan