1. Department of Neurology, Chiayi Chang Gung Memorial Hospital, Chiayi 613, Taiwan
2. College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
3. Department of Nursing, Chang Gung University of Science and Technology, Chiayi Campus, Chiayi 613, Taiwan
4. Health Information and Epidemiology Laboratory, Chang Gung Memorial Hospital, Chiayi 613, Taiwan
5. Department of Neurology, Linkou Chang Gung Memorial Hospital, Taoyuan 333, Taiwan