Received: 10 September 2019
Accepted: 9 June 2020
First Online: 12 June 2020
Ethical 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 study was approved by the Institutional Review Board of Saitama Medical University Hospital (No:18108), and the patients provided written informed consent prior to all procedures.
: Not applicable.
: The authors declare that they have no competing interests.