Takamatsu, Kazunaga http://orcid.org/0000-0002-9992-4419
Article History
Received: 3 May 2018
Accepted: 10 September 2019
First Online: 23 September 2019
Compliance with ethical standards
:
: The author declares no competing interests.
: The present study was approved by the ethical review board of the Japan Medical Association (Approval no. 29-7-1). All procedures were performed in accordance with the ethical standards of the institutional and/or national research committees and the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: The author released the contents of this study, and informed consent was obtained by opt-out system.