1 Department of Orthodontics, Dental Section, Faisalabad Medical University/Punjab Medical College, Faisalabad, Pakistan. Electronic address: dental.concepts@hotmail.com.
2 Department of Orthodontics, Dental Section, Faisalabad Medical University/Punjab Medical College, Faisalabad, Pakistan.
3 Department of Orthodontics, de'Montmorency College of dentistry, Lahore, Pakistan.