8Wityk RJ,Chang HM,Rosengart A,et al.Proximal extracranial vertebral artery disease in the New England Medical Center Posterior Circulation Registry.Arch Neurol,1998,55:470-478.
9Gorelick PB,Caplan LR,Hier DB,et al.Racial differences in the distribution of posterior circulation occlusive disease.Stroke,1985,16:785-790.
10Graf KJ,Pessin MS,DeWitt LD,et al.Proximal intracranial territory posterior circulation infarcts in the New England Medical Center Posterior Circulation Registry.Eur Neurol,1997,37:157-168.