1. Department of Endodontics Dental School Qazvin university of medical sciences shahid bahounar boulevard, P.O. Box: 3419759811 Qazvin Iran
2. Department of Periodontics Faculty of Dentistry Rafsanjan University of Medical Sciences Khalije Fars Blvd., Pasdaran street, P.O. Box: 1946853314 Rafsanjan Iran
3. Dental Research Center Faculty of Dentistry Islamic Azad University of Medical Sciences Shariati St, P.O. Box 19395-1495 Tehran Iran
4. Oral and Maxillofacial Radiology, Private Practice Daroost street, P.O. Box 1944614581 Tehran Iran
5. Student Research Committee, Faculty of Dentistry Mashhad University of Medical Science Mashhad Iran
6. Department of Prosthodontics Shahid Beheshti University of Medical Sciences Daneshjoo Blvd, Velenjak, St., P.O. Box 1983969411 Tehran Iran
7. Department of dentistry Islamic Azad University of Medical Sciences P.O. Box 19585-466 Tehran Iran