1 Department of Orthodontics, Dental Research Center, School of Dentistry, Hamadan University of Medical Sciences & Health Services, Hamadan, Iran.
2 Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences & Health Services, Mashhad, Iran.
3 Private Orthodontist, Mashhad, Iran.
4 Biostatistics and Epidemiology Department, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran.
5 Department of Orthodontics, Dental Research Center, School of Dentistry, Hamadan University of Medical Sciences & Health Services, Hamadan, Iran. Electronic address: vahid.mollabashi@gmail.com.