Funding for this research was provided by:
Japan Society for the Promotion of Science (18K17897)
Received: 3 December 2020
Accepted: 3 April 2021
First Online: 9 April 2021
: The Ethics Committee of the Niigata University approved this study (2015–2410).
: Not applicable.
: JMDC, Inc. created a nationwide claims-based database for our group. Although members of this organization participated in preparing this manuscript, they did not contribute to the data analysis or the conclusions made. Thus, we feel that this does not represent a potential conflict of interest.