Received: 28 February 2020
Accepted: 5 June 2020
First Online: 12 June 2020
Compliance with ethical standards
: The authors have no relevant relationships to disclose.
: This study was conducted in accordance with the ethical standards described in the Declaration of Helsinki. The study protocol was approved by the Institutional Review Board of Hamamatsu University School of Medicine (No. 19-083).
: All of the patients provided written informed consent.