About the Authors
Department of Applied Chemistry, Kogakuin University, Hachioji, Tokyo, Japan
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MS YS FO. Performed the experiments: MO KT FO. Analyzed the data: MO KT. Contributed reagents/materials/analysis tools: MO KT. Wrote the paper: MO FO. Contributed to the critical appraisal of the paper and approved the final version: MO KT MS YS FO.