1Adams H P Jr, Jorgenson D D, Kassell N F, et al. Pitfalls in the recognition of subarachnoid hemorrhage[J ]. JAMA,1980,244:794-- 796.
2Mayer P L, Awad I A, Todor R, et al. MiMiagnosis of symptomatic cerebral aneurysm: prevalence and correlationwith outcome at four instiutions [ J ] . Stroke , 1 9 9 6 , 2 7 :1558 - 1563.