Received: 5 August 2019
Accepted: 6 May 2020
First Online: 1 June 2020
Ethics approval and consent to participate
: The protocol was approved by the Ethics Committee of Yokohama City University Hospital (approval reference number B180301006). Informed consent to participate in the trial was obtained from all patients, who will be informed of the trial results by the investigators.
: Not applicable.
: The authors declare that they have no competing interests.