About the Authors
Department of Mathematical Informatics, The University of Tokyo, Tokyo, Japan
PRESTO, Japan Science and Technology Agency, Kawaguchi, Japan
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MN NM. Performed the experiments: MN. Analyzed the data: MN. Contributed reagents/materials/analysis tools: MN NM. Wrote the paper: MN NM.