1 Division of Orthodontics, Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Riyadh, Saudi Arabia. e_shayea@hotmail.com.
2 Orthodontic Department, Dammam Medical Complex, Ministry of Health, Dammam, Saudi Arabia.
3 Division of Orthodontics, Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.