1. Division of Microbiology, Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
2. Molecular Biology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
3. Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran
4. Department of Microbiology and Immunology, Medical School, Alborz University of Medical Sciences, Karaj, Iran
5. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran