About the Authors
- Ryosuke Niimi
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* E-mail: niimi@L.u-tokyo.ac.jp
Affiliation Graduate School of Humanities and Sociology, The University of Tokyo, Tokyo, Japan
- Katsumi Watanabe
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Affiliation Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
Competing Interests
KW is a member of PLOS ONE editorial board. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.
Author Contributions
Conceived and designed the experiments: RN KW. Performed the experiments: RN. Analyzed the data: RN. Contributed reagents/materials/analysis tools: RN KW. Wrote the paper: RN.