1. Guest Researcher, Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD, USA
2. Research Fellow, Division of Infectious Diseases and Attending Physician, Division of General Internal Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY, USA
3. Attending Physician, Division of General Internal Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY, USA
4. Senior Investigator, Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD, USA