About the Authors

Yasuhito Sawahata

sawahata.y-jq@nhk.or.jp

Affiliation Science and Technology Research Laboratories, NHK (Japan Broadcasting Corporation), Setagaya, Tokyo, Japan

Kazuteru Komine

Affiliation Science and Technology Research Laboratories, NHK (Japan Broadcasting Corporation), Setagaya, Tokyo, Japan

Toshiya Morita

Affiliation Science and Technology Research Laboratories, NHK (Japan Broadcasting Corporation), Setagaya, Tokyo, Japan

Nobuyuki Hiruma

Affiliation Science and Technology Research Laboratories, NHK (Japan Broadcasting Corporation), Setagaya, Tokyo, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YS KK TM NH. Performed the experiments: YS KK TM. Analyzed the data: YS. Contributed reagents/materials/analysis tools: YS KK TM. Wrote the paper: YS KK NH.