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Meyer, Katharina; Stolz, Christian; Rott, Christoph; Laederach-Hofmann, Kurt (2009). Physical activity assessment and health outcomes in old age: how valid are dose–response relationships in epidemiologic studies? European review of aging and physical activity, 6(1), pp. 7-17. Berlin: Springer 10.1007/s11556-009-0042-0
