Goto, Eita http://orcid.org/0000-0001-5870-8122
Article History
Received: 13 May 2020
Revised: 16 July 2020
Accepted: 3 August 2020
First Online: 12 September 2020
Competing interests
: The author declares no competing interests.
: Patient consent was not required, because this study did not use the primary data of human subjects.