Funding for this research was provided by:
Grant-in-Aid for Scientific Research (26293116)
Received: 26 June 2018
Accepted: 29 July 2020
First Online: 3 August 2020
Ethics approval and consent to participate
: 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. This article does not describe any studies with animals performed by any of the authors. This study was approved by the Ethics Committee of Niigata University of Health and Welfare (No. 17560–150205) and the institutional Review Board of St.Luke’s International Hospital (No.15-R086) and informed consent was obtained from all individual participants included in the study. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.