1. Microbiology Research Centre, Pasteur Institute of Iran, Tehran, Iran.
2. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
3. Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M University, Health Science Center, Bryan, Texas, USA.
4. Department of Surgery, Erfan Niayesh Hospital, Tehran, Iran.