1. Department of Endodontics, School of Dentistry, Hamedan University of Medical Sciences, Hamedan, Iran.
2. Iranian Center for Endodontic Research (ICER), Shahid Beheshti University of Medical Sciences, Tehran, Iran.
3. General Dental Practitioner, Hamedan, Iran.
4. Department of Endodontics, School of Dentistry, Ahvaz University of Medical Sciences, Ahvaz, Iran.