1. Department of Endodontics, School of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
2. University of Western Ontario, Department of Epidemiology and Biostatistics, London, Canada
3. Department of Periodontics, School of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
4. School of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
5. Department of Operative Dentistry, School of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
6. School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran