1. Department of Neurology, Kaohsiung Municipal Ta-Tung Hospital, Taiwan, China
2. Department of Neurology, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan, China
3. Department of and Master's Program in Neurology, Faculty of Medicine, Kaohsiung Medical University, Kaohsiung City 80708, Taiwan, China
4. Faculty of Medicine, National Yang- Ming University School of Medicine, Taipei, Taiwan, China
5. Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan, China
6. Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong, China