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APA Citation
Stewart, R. A. H., Joshi, J., Alexander, N., Nihoyannopoulos, P., & Oakley, C. M. (1992). adjustment for the influence of age and heart rate on Doppler measurements of left ventricular filling. Heart, 68(12), 608–612. http://access.bl.uk/ark:/81055/vdc_100144732677.0x000042