1. Department of Infectious Diseases and Clinical Microbiology, University of Health Sciences Turkey, Tepecik Training and Research Hospital, Izmir, Turkey
2. Division of Infectious Diseases, Department of Internal Medicine University of California Davis Medical Center, Sacramento, California, USA
3. Department of Medical Microbiology and Immunology, University of California Davis Medical Center, Sacramento, California, USA
4. University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
5. Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
6. VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania, USA