1. Department of Microbiology, Hamadan University of Medical Sciences, Hamadan, Iran
2. Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
3. Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
4. Oral Microbiology Laboratory, Department of Microbiology, Tehran University of Medical Sciences, Tehran, Iran