Received: 4 December 2020
Accepted: 29 April 2021
First Online: 4 June 2021
: The study was approved by the Okayama University Research Ethics Committee (Study Number: 826). The authors confirmed that all the methods were carried out in accordance with the relevant guidelines and regulations. Informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.