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Authors
Koyama, Soichiro https://orcid.org/0000-0001-5837-8477
Iwata, Kenji
Nakamura, Yusuke
Sako, Ikuko
Tanabe, Shigeo
Otaka, Yohei
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Funding
Funding for this research was provided by:
This study was funded by Unicharm Corporation.
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Article History
Received: 6 October 2025
Accepted: 5 February 2026
First Online: 23 February 2026
Declarations
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: This study was conducted in accordance with the principles of the Declaration of Helsinki and approved by the Ethics Review Committee of our university (No. HM 23–214). All participants provided written informed consent before participating in the study.
: Not applicable.
: Competing interests: The authors (KI, YN, and IS) are employees of Unicharm Corporation, which manufactures and sells the products used in this study.
