¹Department of Neurology, Pusan National University Yangsan Hospital, Yangsan, Korea
²Department of Rehabilitation Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea
³Research Institute for Congervence of Biomedical Science and Technology, Yangsan, Korea
⁴Pusan National University School of Medicine, Yangsan, Korea

Corresponding author:  Dae-Seong Kim, Tel: +82-55-360-2450 , Fax: +82-55-360-2152, 
Email: dskim@pusan.ac.kr

Received: 18 February 2015   • Accepted: 26 July 2015