About the Authors

Takeshi Hara

hara-t@mandom.co.jp

Affiliation Technical Development Center, Mandom Corp., Osaka, Japan

Hiroshi Matsui

Affiliation Technical Development Center, Mandom Corp., Osaka, Japan

Hironori Shimizu

Affiliation Technical Development Center, Mandom Corp., Osaka, Japan

Competing Interests

Financial support for this research was provided by Mandom Corp. The authors’ employer (Mandom Corp.) played no role in the study design, data acquisition, or decision to publish. All authors are employed by Mandom Corp. The authors declare that they have applied for a patent related to GGR and EPC-K1 used in this study (JP2013203701A, JP2014051466A). Dr. Hara states that this does not alter their adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: TH HS. Performed the experiments: TH HS HM. Analyzed the data: TH HS. Contributed reagents/materials/analysis tools: TH HM. Contributed to the writing of the manuscript: TH.