1. An assessment of the occlusion of the teeth of youths 12-17 years;Kelly;Vital Health Stat,1977
2. Oral health status in the United States: prevalence of malocclusion;McLain;J Dent Educ,1985
3. Prevalence of malocclusion and orthodontic treatment need in the United States: estimates from the NHANES III survey;Proffit;Int J Adult Orthod Orthognath Surg,1998
4. Components of Class II malocclusion in children 8-10 years of age;McNamara;Angle Orthod,1981
5. Contemporary Orthodontics;Proffit,1993