1. Department of Oral and Maxillofacial Radiology, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran.
2. Department of Otorhinolaryngology, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran.
3. Student Research Committee, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran.
4. Department of Orthodontics, School of Dentistry, Kermanshah University of Medical Sciences, Kermanshah, Iran.