Received: 11 July 2020
Accepted: 11 February 2021
First Online: 22 February 2021
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Chiba University School of Medicine (Chiba, Japan). A detailed explanation of the study was given to all participants, who confirmed that they fully understood the information before voluntarily giving informed consent to participate. They signed the informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.