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Ahmad, Y., Howard, J., Arnold, A., Shun-Shin, M., Cook, C., Malik, I., Mayet, J., Francis, D., & Sen, S. (n.d.). 2 PFO closure is superior to medical therapy for cryptogenic stroke: a meta-analysis of randomised controlled trials. Heart, 104, A2. http://access.bl.uk/ark:/81055/vdc_100144713971.0x00000a