About the Authors

Takahiro Ando

Affiliation Department of Electronics and Electrical Engineering, Keio University, Yokohama, Japan

Shunichi Sato

shunsato@ndmc.ac.jp

Affiliation Division of Biomedical Information Sciences, National Defense Medical College Research Institute, Tokorozawa, Japan

Terushige Toyooka

Affiliation Department of Neurosurgery, National Defense Medical College, Tokorozawa, Japan

Hiroaki Kobayashi

Affiliation Department of Neurosurgery, National Defense Medical College, Tokorozawa, Japan

Hiroshi Nawashiro

Affiliation Department of Neurosurgery, National Defense Medical College, Tokorozawa, Japan

Hiroshi Ashida

Affiliation Division of Biomedical Information Sciences, National Defense Medical College Research Institute, Tokorozawa, Japan

Minoru Obara

Affiliation Department of Electronics and Electrical Engineering, Keio University, Yokohama, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TA SS TT HK HN MO. Performed the experiments: TA TT HK. Analyzed the data: TA SS TT HK HN MO. Contributed reagents/materials/analysis tools: HN HA. Wrote the paper: TA SS MO.