About the Authors

Naoki Masuda

masuda@mist.i.u-tokyo.ac.jp

Affiliation Department of Mathematical Informatics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, Japan

Issei Kurahashi

Affiliation iAnalysis LLC, 2-2-15 Minamiaoyama, Minato-ku, Tokyo, Japan

Hiroko Onari

Affiliation iAnalysis LLC, 2-2-15 Minamiaoyama, Minato-ku, Tokyo, Japan

Competing Interests

The authors have read the journal's policy and have the following interest: Authors Issei Kurahashi and Hiroko Onari are affiliated with iAnalysis LLC, Japan. There are no patents, products in development or marketed products to declare. 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: NM. Performed the experiments: HO. Analyzed the data: HO. Contributed reagents/materials/analysis tools: IK NM. Wrote the paper: NM.