1. Department of Internal Medicine, Iwate Medical University, Morioka, Japan
2. Department of Hygiene and Preventive Medicine, Iwate Medical University, Morioka, Japan
3. Department of Neurosurgery, Iwate Medical University, Morioka, Japan
4. Department of Neurology, Iwate Medical University, Morioka, Japan
5. Department of Nutritional Sciences, Morioka University, Takizawa, Japan
6. Department of Health and Physical Education, Faculty of Education, Iwate University, Morioka, Japan
7. The Research Institute of Strategy for Prevention, Tokyo, Japan