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Venn diagram that summarizes causes of ESUS and detailed distribution of recurrent stroke. AC = atrial cardiopathy, ESUS = embolic stroke of undetermined source, NS = not significant, SCAF = subclinical atrial fibrillation. *: atrial cardiopathy was defined as P wave duration (PWD) ≥ 135 ms; “∩” and “U” symbols indicate an intersection and a union of two groups, respectively.
