Received: 31 July 2021
Accepted: 8 March 2022
First Online: 30 March 2022
: This study has been conducted in accordance with the Declaration of Helsinki and the Ethical Guidelines for Epidemiological Research by the Japanese Government. All participants received an explanation of the study and provided their written informed consent before the baseline survey. This study has been approved by the research ethics committee of Waseda University (approval number: 2014-G002 and 2018-G001).
: Not applicable.
: The authors declare that they have no competing interests.