1. Department of International Health Johns Hopkins Bloomberg School of Public Health Baltimore Maryland USA
2. Division of Infectious Diseases Johns Hopkins University School of Medicine Baltimore Maryland USA
3. Department of Emergency Medicine Johns Hopkins University School of Medicine Baltimore Maryland USA
4. Department of Emergency Medicine Chang Gung Memorial Hospital Keelung Taiwan
5. Clinical Informatics and Medical Statistics Research Center Chang Gung University Taoyuan Taiwan
6. W. Harry Feinstone Department of Molecular Microbiology and Immunology Johns Hopkins Bloomberg School of Public Health Baltimore Maryland USA