七、Cochrane协作网（Stroke）脑卒中组提供的检索策略

4 . ( cerebral or cerebellar or brainstem or vertebrobasilar ) . tw .5 . ( infarct $ or isch ? emi $ or thrombo $ or emboli $ ) . tw .9 . ( brain or intraventricular or brainstem or cerebellar ) . tw .12 . ( haemorrhage or hemorrhage or haematoma or hemat ......