Assignment was treated as if randomized within levels of the following baseline covariates: severity of MI (STEMI/NSTEMI, Killip class), center where PCI took place (university hospital/nonuniversity hospital), demographics (sex, age), lifestyle characteristics (weight), laboratory measurements (GFR), diagnoses (bleeding, anemia), and medications (warfarin, novel oral anticoagulants, P2Y12 inhibitors). The gene discussed is P2RY12; the disease is anemia (phenotype).