1. Marmara University, Faculty of Medicine, Department of Microbiology, Istanbul, Turkey
2. Research Service, VA Medical Center West Los Angeles, CA, USA
3. Department of Botany and Microbiology, University of Oklahoma, Norman, USA
4. Department of Microbiology, Immunology, and Molecular Genetics, UCLA School of Medicine, Los Angeles, CA, USA
5. Department of Medicine, UCLA School of Medicine, Los Angeles, CA, USA
6. Infectious Diseases Section, VA Medical Center, West Los Angeles, CA, USA