About the Authors

Ryota Nomura

nomuraryota@gmail.com

Affiliation Department of Education, The University of Tokyo, 7-3-1, Hongo, Bunkyo ward, Tokyo, Japan

Yingzong Liang

Affiliation Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo ward, Tokyo, Japan

Takeshi Okada

Affiliation Department of Education, The University of Tokyo, 7-3-1, Hongo, Bunkyo ward, Tokyo, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RN TO. Performed the experiments: RN. Analyzed the data: RN. Contributed reagents/materials/analysis tools: YL. Wrote the paper: RN TO.