1. Oral and Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
2. Professor, Department of Oral Medicine, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
3. Dentist, Tehran, Iran
4. Master student in Biostatistics, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran
5. Assistant Professor, Department of Oral Medicine, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran