1. Student Research Committee, Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
2. Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3. Centre for Clinical Microbiology, UCL Royal Free Hospital, London, United Kingdom
4. Department of Epidemiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
5. Division of Infectious Diseases, Department of Medicine, University of Kansas, Kansas City, Kansas, USA