Prevention of vascular complications after cerebral ischaemia of arterial origin. The ESPRIT study: mild anticoagulant t动脉源性脑缺血后血管并发症的预防。ESPRIT研究：轻度抗凝血治疗、乙酰水杨酸和双嘧达莫联合治疗，还是单纯乙酰水杨酸治疗？