1. Department of Oral Public Health Dental Research Center School of Dentistry Isfahan University of Medical Sciences Isfahan Iran
2. Department of Oral Public Health Dental Material Research Center School of Dentistry Isfahan University of Medical Sciences Isfahan Iran
3. Faculty of Dentistry University of Toronto Toronto ON Canada
4. Clinical Epidemiology & Health Care Research Faculty of Medicine Institute of Health Policy, Management and Evaluation University of Toronto Toronto ON Canada
5. Divisions of Endodontics and Research Department of Dentistry Mount Sinai Hospital Toronto ON Canada