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Mold JW, Pasternak A, McCaulay A, Manca D, Rubin G, Westfall J, Beasley J, Hickner J, Fagnan LJ, Handley M, Haddy R, Hankey T, Practice-Based Research Subcommittee of North American Primary Care Research Group Committee on Advancing Science of Family Medicine. Definitions of common terms relevant to primary care research. Annals of Family Medicine 2008;6(6):570-571.