1. Department of Molecular Genetics, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
2. Department of Neurology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
3. Department of Neurology, Joetsu General Hospital, Joetsu 943-0172, Japan
4. Department of Neurology, Sado General Hospital, Sado 952-1209, Japan
5. Department of Neurology, Tsubame Rosai Hospital, Tsubame 959-1228, Japan
6. Department of Neurology, Niigata City General Hospital, Niigata 950-1197, Japan
7. Department of Neurology, Tsukuba University, Tsukuba 950-1197, Japan
8. Department of Neurology, Kido Hospital, Niigata 950-0862, Japan