1. Department of Neurology, Osaka University Graduate School of Medicine, Osaka, Japan.
2. Department of Neurology, Osaka Kosei-Nenkin Hospital, Osaka, Japan.
3. Departments of Physiology and Biosignaling, Osaka University Graduate School of Medicine, Osaka, Japan.
4. Brain Information Group, Kansai Advanced Research Center, National Institute of Information and Communications Technology, Kobe, Japan.
5. Department of Biomedical Engineering, National Cardiovascular Center Research Institute, Osaka, Japan.