1 Department of Oral and Maxillofacial Pathology, School of dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
2 Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
3 Department of Periodontology, School of dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Electronic address: dr.f.attarbashi@gmail.com.