About the Authors

Maiko Saito

maiko.saito@pc.hoya.co.jp

Affiliation R&D Department, PENTAX New Ceramics Division, HOYA Corporation, Tokyo, Japan

Yae Kurosawa

Affiliation R&D Department, PENTAX New Ceramics Division, HOYA Corporation, Tokyo, Japan

Tsuneo Okuyama

Affiliation Protein Technos Institute, Kanagawa, Japan

Competing Interests

Maiko Saito and Yae Kurosawa are employees by HOYA Corporation. 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: MS YK TO. Performed the experiments: MS. Analyzed the data: MS. Contributed reagents/materials/analysis tools: MS. Wrote the paper: MS.