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Meyer, Katharina; Rezny, Linda; Breuer, Christoph; Lamprecht, Markus; Stamm, Hans Peter (2005). Physical activity of adults aged 50 years and older in Switzerland. Sozial- und Präventivmedizin, 50(4), pp. 218-229. Birkhäuser 10.1007/s00038-005-4093-3
