Funding for this research was provided by:
NCGM COVID-19 Gift Fund (19K059)
Japan Health Research Promotion Bureau Research Fund (2020-B-09)
Received: 4 July 2022
Accepted: 25 September 2022
First Online: 13 October 2022
: The study procedure was approved by the ethics committee of NCGM (NCGM-G-003598).
: Not applicable.
: Antibody assay reagent was provided by Abbott Japan.