Kikuchi, Yoshinori
Shimada, Hideaki http://orcid.org/0000-0002-1990-8217
Yamaguchi, Kazuhisa
Igarashi, Yoshinori
Article History
Received: 25 December 2018
Accepted: 17 January 2019
First Online: 18 February 2019
Compliance with ethical standards
:
: The authors have no conflicts of interest associated with this manuscript.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Ethical approval is not required because all data in this study uses Ichushi-Web database.
: Informed consent is not required because all data in this study uses Ichushi-Web database.