1. Department of Neurological Surgery, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan
2. Department of Biochemistry and Genetics, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan
3. Department of Clinical Oncology, Graduate School of Medicine, Toho University, Tokyo 143-8541, Japan
4. Department of Gastroenterological Surgery, Graduate School of Medicine, Toho University, Tokyo 143-8541, Japan
5. Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
6. Department of Pharmacology, Shiga University of Medical Science, Otsu 520-2192, Japan
7. Comprehensive Stroke Center, Chiba University Hospital, Chiba 260-8677, Japan
8. Department of Neurological Surgery, Chiba Prefectural Sawara Hospital, Chiba 287-0003, Japan
9. Department of Neurological Surgery, Chiba Cerebral and Cardiovascular Center, Chiba 290-0512, Japan
10. Department of Neurosurgery, Eastern Chiba Medical Center, Chiba 283-8686, Japan
11. Department of Endocrinology, Hematology and Gerontology, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan
12. Department of Diabetes, Metabolism and Endocrinology, School of Medicine, International University of Health and Welfare, Chiba 286-8686, Japan
13. Department of Cardiovascular Medicine, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan
14. Port Square Kashiwado Clinic, Kashiwado Memorial Foundation, Chiba 260-0025, Japan
15. Medical Project Division, Research Development Center, Fujikura Kasei Co., Saitama 340-0203, Japan