1. Department of Neurology, Catholic University of Daegu School of Medicine, Daegu, Korea.
2. Department of Neurology, Wake Forest University School of Medicine, Winston-Salem, NC, USA.
3. Medical Statistics & Informatics, Catholic University of Daegu School of Medicine, Daegu, Korea.
4. Department of Neurology, CHA Gumi Medical Center, CHA University, Gumi, Korea.