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    Marlena Schnieder et al.. “Low flow in the left atrial appendage assessed by transesophageal echocardiography is associated with increased stroke severity—Results of a single-center cross-sectional study.” International journal of stroke, vol. 14, no. 4, 2019, pp. 423–429. http://access.bl.uk/ark:/81055/vdc_100090437940.0x000015