CYP2C19 and ischemic stroke: To evaluate the expression of selected platelet miRNAs (miR-126-3p, miR-19a-3p, miR-19b-3p, miR-22-3p, miR-185-5p) in patients with ischemic stroke in relation to the CYP2C19 genotype (*1/*1,*1/*2, *2/*2) during clopidogrel treatment.