*Department of Orthodontics, Dental School

†Department of Biostatistics, Health Sciences Research Center, School of Health, Mashhad University of Medical Sciences

‡Dental School, Mashhad University of Medical Sciences

§Private Practice, Mashhad, Iran

This study was supported by the vice-chancellor of research of Mashhad University of Medical Sciences. The results of this study are drawn from an undergraduate thesis (No=3347)

Address correspondence and reprint requests to Sabzevari Berahman, Orthodontist, No 17, Kolahdoz Blvd, Mashhad, 9183896814, Iran; E-mail: [email protected]

The authors report no conflicts of interest.

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