INTRAOPERATIVE DUPLEX SONOGRAPHY FOR THE TREATMENT OF LARGE AND GIANT ANEURYSMS. RETROSPECTIVE ANALYSIS OF 13 CASES Slavomir Kondoff1, Nurfet Alioski1, Toma Spiriev1, Jeliazko Vassilev2, Georgi Simeonov2, Christina Kostadinova2 June 6, 2015 Published in Neurosurgery