United States. Congress. Office of Technology Assessment. The Implications of Cost-Effectiveness Analysis of Medical Technology: Background Paper 2: Case Studies of Medical Technologies: Case Study 5: Periodontal Disease: Assessing the Effectiveness and Costs of the Keyes Technique. [Washington D.C.]. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc39456/. Accessed January 22, 2017.
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