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APA Citation
Raymond, I., Pedersen, F., Steensgaard-Hansen, F., Green, A., Busch-Sorensen, M., Tuxen, C., Appel, J., Jacobsen, J., Atar, D., & Hildebrandt, P. (2003). prevalence of impaired left ventricular systolic function and heart failure in a middle aged and elderly urban population segment of Copenhagen. Heart, 89(12), 1422–1429. http://access.bl.uk/ark:/81055/vdc_100135136562.0x000012