1. Dental services: use, expenditures and sources of payment, 1987;Manski;J Am Dent Assoc,1999
2. Prevelence of malocclusion and orthodontic treatment need in the United States: estimates from the NHANES III Survey;Proffit;Int J Adult Orthodont Orthognath Surg,1998
3. Orthodontic treatment demand and need in third and fourth grade schoolchildren;Wheeler;Am J Orthod Dentofacial Orthop,1994
4. Questionnaire and data collection methods for the household survey and the survey of American Indians and Alaska Natives, Methods 2;Edwards,1989
5. National Medical Expenditure Survey: Household Survey Final Methodology Report, Deliverable No. 1.163;Harper,1991