Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H21-Junkanki- Ippan- 013)
Received: 22 October 2020
Accepted: 26 November 2020
First Online: 14 December 2020
Ethics approval and consent to participate
: The research plan was approved by the Ethical Committee of the National Institute of Health and Nutrition and Saku Central Hospital. Written informed consent was obtained from all participants before the study was initiated.
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.