interventions
Adding dipyridamole to aspirin,        substituting clopidogrel for aspirin, and carotid endarterectomy are all       expensive interventions to prevent stroke, but if ways could be found to focus       them on those patients at especially high risk, they would become more       affordable.
Adding dipyridamole to aspirin,        substituting clopidogrel for aspirin, and carotid endarterectomy are all       expensive  @SUBJECT$  to  @PREDICAT$   @OBJECT$ , but if ways could be found to focus       them on those patients at especially high risk, they would become more       affordable.