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APA Citation
Pan, K., Singer, D. E., Ovbiagele, B., Wu, Y., Ahmed, M. A., & Lee, M. (2017). effects of Non–Vitamin K Antagonist Oral Anticoagulants Versus Warfarin in Patients With Atrial Fibrillation and Valvular Heart Disease: A Systematic Review and Meta‐Analysis. Journal of the American Heart Association, 6(7), n/a. http://access.bl.uk/ark:/81055/vdc_100073665096.0x000006