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APA Citation
Morgan, S., Smith, H., Simpson, I., Liddiard, G. S., Raphael, H., Pickering, R. M., & Mant, D. (1999). prevalence and clinical characteristics of left ventricular dysfunction among elderly patients in general practice setting: cross sectional survey. BMJ, 318(7180), 368–372. http://access.bl.uk/ark:/81055/vdc_100180428517.0x000005