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APA Citation
Levy, T., Walker, S., Mason, M., Spurrell, P., Rex, S., Brant, S., & Paul, V. (2001). importance of rate control or rate regulation for improving exercise capacity and quality of life in patients with permanent atrial fibrillation and normal left ventricular function: a randomised controlled study. Heart, 85(2), 171–178. http://access.bl.uk/ark:/81055/vdc_100151254367.0x000006