The prognostic role of ankle brachial index in patients with acute ischemic stroke Konstantinos Tziomalos, Vasilios Giampatzis, Stella D. Bouziana, Athinodoros Pavlidis, Marianna Spanou, Giannis Kagelidis, Chrysoula Boutari, Christos Savopoulos, Apostolos I. Hatzitolios