7Weisberg LA.Clinical characteristics of transient ischemic attacks inblack patients[J].Neurology,1991,41:1410.
8Vrethem M,Johansson I.Prognosis in patients with transient ischemic attacks and minor strock associated with a normal angiogram[J].European Neurology,1990,30:203.
9Brust JC.Transient ischemic attacks:natural history and anti-coagulation[J].Neurology,1977,24:701.