( @ ) PF@/H antibody-positive patients suffered a significantly higher incidence of thrombosis than those who were antibody-negative ; ( @ ) PF@/H antibody-positive patients who survived a thrombosis manifested a significantly longer bleeding time and decreased maximum percentage of platelet aggregation inhibition ; ( @ ) aspirin and clopidogrel decreased the incidence of thrombosis in PF@/H antibody-positive patients by inhibiting platelet activation .