1. Department of Internal Medicine, Osaka Red Cross Hospital, Japan
2. Department of Diabetes and Endocrinology, Osaka Red Cross Hospital, Japan
3. Department of Neurology, Osaka Red Cross Hospital, Japan
4. Department of Respiratory Medicine, Osaka Red Cross Hospital, Japan
5. Department of Neurology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Japan
6. Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Japan