Takumi, Koji
Nagano, Hiroaki
Kikuno, Hidehiko
Kumagae, Yuichi
Fukukura, Yoshihiko
Yoshiura, Takashi
Article History
Received: 31 October 2020
Accepted: 19 January 2021
First Online: 2 February 2021
Competing interests
: The authors declare no competing interests.