1. Dental Implant Research Center, Department of Oral and Maxillofacial Radiology, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
2. Department of Oral and Maxillofacial Radiology, School of Dentistry, Urmia University of Medical Sciences, Urmia, Iran.
3. Department of Epidemiology and Noncommunicable Disease Research Center, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran.
4. Department of Radiology, Tehran Dental Branch, Islamic Azad University, Tehran, Iran.