1. Department of Prosthodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
2. Department of Microbiology, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran.
3. Dental Research Center, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
4. Department of Medical Parasitology and Mycology Department, School of Medicine, Hamadan University of Medical Sciences and Health Services, Hamadan, Iran.
5. Department of Biostatistics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran.