CYP2C19 and Stroke: The subsequent subgroup analysis based on patient’s ethnic origin revealed a firm association of CYP2C19 genotype with risk of stroke in patients of East-Asian ancestry (RR: 1.93, 95%CI: 1.55–2.39, P < 0.00001), while a large uncertainty of the pooled estimate was found in patients with European ancestry (RR: 2.46, 95%CI: 1.06–5.72, P < 0.04).