were free of signs or symptoms of focal vascular territory ischemic brain injury, did not have intracranial arterial narrowing on MR angiography (MRA) and who were at low risk for stroke as determined by transcranial Doppler ultrasonography (TCD).
were free of signs or symptomsof focal vascular territory ischemic braininjury, did not have intracranial arterial narrowingon MR angiography (MRA) and whowere at low risk for stroke as determined bytranscranial Doppler ultrasonography (TCD).