1. School of Dentistry, Zanjan University of Medical Sciences, Zanjan, Iran
2. Department of Oral and Maxillofacial Medicine, School of Dentistry, Zanjan University of Medical Sciences, Zanjan, Iran
3. Department of Microbiology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
4. Oral and Maxillofacial Specialist, Vancouver, British Columbia, Canada
5. Department of Operative Dentistry, School of Dentistry, Zanjan University of Medical Sciences, Zanjan, Iran