1. Division of Clinical Genetics, Hokkaido University Hospital, Sapporo, Japan;
2. Department of Neurology, Hokkaido University Graduate School of Medicine, Sapporo, Japan;
3. Molecular Genetic Testing Group, Molecular Genetic Analysis Department, Molecular Pathology Esoteric Analysis Center, LSI Medience Corporation, Tokyo, Japan;
4. Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Matsumoto, Japan;