1. Department of Metabolic Medicine, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
2. Office of Biostatistics and Data Management, National Cerebral and Cardiovascular Center, Osaka 565-8565, Japan
3. Department of Neurosurgery, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
4. Department of Neuromodulation and Neurosurgery, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
5. Department of Pathology, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan