1. Dental Students Research Committee, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
2. The School of Public Health, Boston University, Boston, Massachusetts, United States
3. Dental Prosthodontics Department, Dental Materials Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
4. Department of Prosthodontics, School of Dentistry, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium