Takeuchi, Michio
Sakai, Toshihiko
Andocs, Gabor
Takao, Keizo
Nagaoka, Ryo
Hasegawa, Hideyuki
Article History
Received: 21 January 2020
Accepted: 4 May 2020
First Online: 3 June 2020
Competing interests
: The authors declare no competing interests.