From the Department of Neurology, Seoul National University Hospital, Seoul, Republic of Korea

We are retracting our review article [J Clin Neurol 2008;4:139-147], because it was noted that several expressions of this article were identical to those of previously published paper without the proper citation [Stroke 2008;39:2158-2165]. We deeply regret this unintended plagiarism. We would like to express our most sincere apology to Dr. Rouhl and the Stroke Journal and to the Editor and readers of Journal of Clinical Neurology.