1. Department of Pediatric Dentistry, Faculty of Dentistry, Mazandaran University of Medical Sciences, Sari, Iran
2. Graduate Student of Dentistry, Mazandaran University of Medical Sciences, Sari, Iran
3. Department of Operative Dentistry, Faculty of Dentistry, Mazandaran University of Medical Science, Sari, Iran
4. Department of Biostatistics, Health Sciences Research Center, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran