1. Section of Infectious Diseases, Department of Medicine, Veterans General Hospital-Taipei, Taiwan, ROC and Department of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC.
2. Center for the Study of Emerging and Re-emerging Pathogens, Division of Infectious Diseases and Department of Internal Medicine, The University of Texas Medical School at Houston, Houston, TX 77030.
3. Center for the Study of Emerging and Re-emerging Pathogens, Division of Infectious Diseases and Department of Internal Medicine, The University of Texas Medical School at Houston, Houston, TX 77030 and Division of Infectious Diseases, Department of Internal Medicine, Ramathibodi Hospital, Rajjatheve, Bangkok, Thailand.
4. Center for the Study of Emerging and Re-emerging Pathogens, Division of Infectious Diseases, Department of Internal Medicine and Department of Microbiology and Molecular Genetics, The University of Texas Medical School at Houston, Houston, TX 77030.