¹Department of Neurology, Kyungpook National University School of Medicine, Daegu, Korea
²Department of Radiology, Kyungpook National University Medical Center, Daegu, Korea

Corresponding author:  Jin-Sung Park, Tel: +82-53-200-2753, Fax: +82-53-200-2168, 
Email: jinforeva@gmail.com

Received: 12 November 2014   • Accepted: 26 February 2015