Fukushima, Naoko
Aoki, Hiroaki
Takenaga, Shinsuke
Morikawa, Kazuhiko
Ogawa, Masaichi
Yanaga, Katsuhiko
Article History
Received: 11 November 2019
Accepted: 10 January 2020
First Online: 13 January 2020
Ethics approval and consent to participate
: Not applicable
: Not applicable
: The authors declare that they have no competing interests.