1. Department of Pediatric Dentistry, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
2. Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
3. Department of Public Health and Health Systems, Nagoya University Graduate School of Medicine, Nagoya, Japan
4. Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
5. Department of Oral and Maxillofacial Surgery, School of Dentistry, Guilan University of Medical Sciences, Iran