Funding for this research was provided by:
UCBJ Grant office
Received: 16 April 2020
Accepted: 13 July 2020
First Online: 25 July 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the institutional review board of the Gunma University Hospital. Patients provided written informed consent before taking part in this study.
: The authors declare that they have no competing interests.