Kuroda, Yutaka
Kawai, Toshiyuki
Goto, Koji
Matsuda, Shuichi
Article History
Received: 5 April 2019
Accepted: 25 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: As this is a literature review, and this study did not involve any intervention in humans, there is no need for ethics approval or consent to participate in this study.
: Not applicable.
: The authors declare that they have no competing interests.