Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H25-Junkankitou-Seishuu-Sitei-022, H30-Junkankitou-Seishuu-Sitei-002, H22-Junkankitou-Seishuu-Sitei-017)
Received: 11 March 2021
Accepted: 25 April 2021
First Online: 7 May 2021
: The Institutional Review Board of Shiga University of Medical Science approved this study (No. 22–29, 2010). This study was carried out in accordance with the Declaration of Helsinki. Written informed consent from each participant was obtained before enrollment.
: Not applicable.
: The authors declare that they have no competing interests.