vertebrobasilar artery Article 1 Student t test 1 adult 1 angiography 1 artery diameter 1 artery dysplasia 1 basilar artery 1 basilar artery fenestration 1 blood clotting 1 brain ischemia 1 clinical article 1 computational fluid dynamics 1 controlled study 1 female 1 hemodynamic 1 hemodynamic parameters 1 hemodynamics 1 hemolytic plaque assay 1 high resolution MRI 1 human 1 ischemic stroke 1 male 1 middle aged 1 morphometry 1 nomogram 1 oscillatory shear index 1 pilot study 1 predictive model 1 rank sum test 1