1. Department of Virology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
2. Virology Department, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
3. Department of Microbiology, Faculty of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
4. Department of Pathology, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
5. Department of Epidemiology & Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran