CONCLUSION : The rate of major hemorrhage was high in this old , frail group , but excluding fatalities , resulted in no long-term sequelae , and the stroke rate on warfarin was low , demonstrating how effective warfarin treatment is .
O O O O O O B-DiseaseOrPhenotypicFeature O O O O O O O O O O O O O O O O O O O O O B-DiseaseOrPhenotypicFeature O O B-ChemicalEntity O O O O O O B-ChemicalEntity O O O