Funding for this research was provided by:
Ministry of Health, Labour and Welfare
JSPS KAKENHI (18K01988)
Received: 6 April 2020
Accepted: 29 July 2020
First Online: 8 August 2020
Ethics approval and consent to participate
: This study was approved by the Ethical Committee of the Japan Foundation for the Promotion of International Medical Research Cooperation (H181211). Written informed consent was obtained from all participants after full disclosure and an explanation of the purpose and procedures of this study. This study was conducted according to the principles of the Declaration of Helsinki. This trial has been registered with the University Hospital Medical Information Network (UMIN000000662).
: Not applicable.
: The authors declare that they have no competing interests.