Magnetic resonance angiography and transcranial Doppler ultrasound findings in patients with a clinical diagnosis of vertebrobasilar insufficiency Arlindo Cardoso Lima Neto; Edson Bor-Seng-Shu; Marcelo de Lima Oliveira; Alberto Macedo-Soares; Flávia Renata Topciu; Roseli Saraiva Moreira Bittar;