Yatsuya, Hiroshi http://orcid.org/0000-0002-6220-9251
Tsugane, Shoichiro http://orcid.org/0000-0003-4105-2774
Article History
Received: 22 December 2020
Revised: 12 January 2021
Accepted: 26 January 2021
First Online: 18 February 2021
Compliance with ethical standards
:
: The authors declare no competing interests.
Free to read: This content has been made available to all.