Article History
Received: 31 October 2018
Accepted: 3 November 2018
First Online: 19 November 2018
Compliance with ethical standards
:
: All the authors have declared no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee at which the studies were conducted (local ethics committee of Matsuyama Red Cross Hospital (No. 582); (UMIN clinical trial registry No. UMIN000025889)) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: This study waived the requirement for written informed consent due to the retrospective nature of this study. Rather, the research content has been included on the web page of our hospital ().