Text and Data Mining valid from 2019-04-11
Received: 15 May 2018
Accepted: 3 January 2019
First Online: 11 April 2019
Compliance with ethical standards
: All the authors declare that they have 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 and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The committee on human research at Ichiyokai Hospital approved the study protocol (Authorization No. 201706).
: Informed consent was obtained from all individual participants included in this study.