1. Department of Neurology, Methodist Neurological Institute, Houston, Texas, USA, , Department of Neurology, Aikawa Hospital, Japan
2. Department of Neurology, Aikawa Hospital, Japan
3. Department of Neurology, Toho University Omori Medical Center, Tokyo, Japan
4. First Department of Internal Medicine, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan