1. Division of Neurology, First Department of Internal Medicine, Asahikawa Medical University, Japan
2. Division of Cardiology, First Department of Internal Medicine, Asahikawa Medical University, Japan
3. Department of Clinical Pathology, Asahikawa Medical University, Japan
4. Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Japan
5. Department of Pathology, National Cerebral and Cardiovascular Center, Japan