author:V.F. OR author:Z?tola OR author:M.C. OR author:Lange OR author:J.A. OR author:Muzzio OR author:E.M. OR author:N?vak OR author:R.C. OR author:Mendes OR author:L.C. OR author:Werneck OR Vertebrobasilar insufficiency: the usefulness of transcranial doppler as a complementary method
