1. Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan
2. Infection Control Centre, MacKay Memorial Hospital, Taipei, Taiwan
3. Department of Microbiology and Immunology, School of Medicine, China Medical University, Taichung, Taiwan
4. Department of Internal Medicine, National Cheng Kung University Medical College and Hospital, Tainan, Taiwan
5. Division of Infectious Disease, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
6. Department of Laboratory Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan