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3. Physical activity, exercise, and physical fitness: Definitions and distinctions for health-related research;Caspersen;Public Health Rep.,1985
4. Assessment of physical activity in epidemiologic research: Problems and prospects;LaPorte;Public Health Rep.,1985
5. The spectrum of physical activity, cardiovascular disease and health: An epidemiologic perspective;LaPorte;Amer. J. Epidemiol.,1984