Funding for this research was provided by:
Japan Society for the Promotion of Science (16H03276)
Article History
Received: 22 October 2019
Accepted: 9 August 2020
First Online: 6 October 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee at Tokyo Medical and Dental University (M2017–243). All the participants including minors who responded the questionnaires were assumed to consent to the study participation. This procedure was approved by the Ethics Committee at Tokyo Medical and Dental University.
: Not applicable.
: We declared that there is no conflict of interests.