Funding for this research was provided by:
NCGM COVID-19 Gift Fund (19K059)
Japan Health Research Promotion Bureau Research Fund (2020-B-09)
Received: 7 September 2022
Accepted: 20 April 2023
First Online: 4 May 2023
: The study was conducted according to the guidelines of the Declaration of Helsinki, and the procedure was approved by the Ethics Committee of the National Center for Global Health and Medicine (approval number: NCGM-G-003598). Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.