Article History
Received: 20 April 2018
Accepted: 5 July 2018
First Online: 7 July 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: Approval for this study was granted by the Ethics Committee of Nihon University School of Medicine and National Research Committee. All procedures performed in studies involving human participants were in accordance with the ethical standards of this Ethics Committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all participants included in the study.