1. Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
2. Department of Periodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
3. Research Center for Evidence-Based Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
4. Department of Restorative Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran