1. Student Research Committee, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
2. Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, Canada.
3. Research Center for Evidence Based Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
4. Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.