Funding for this research was provided by:
The Kimura Memorial Heart Foundation, Fukuoka (N/A)
Grant-in-Aid for Scientific Research (C) from the Ministry of Education, Culture, Sports, Science and Technology (19K10675)
Received: 12 November 2020
Accepted: 4 February 2021
First Online: 19 February 2021
Ethics approval and consent to participate
: The mayor and the welfare section of Uku town and the Ethical Committee of Kurume University (No. 2284) approved this study. The study conformed to the principles of the declaration of Helsinki. All participants gave informed consent.
: Not applicable, as the study does not contain personal information.
: The authors declare no competing interests.