1. Department of Microbiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
2. Student Research Committee, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
3. Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
4. Razi Clinical Research Development Center, Guilan University of Medical Sciences, Rasht, Iran.