Text and Data Mining valid from 2020-04-07
Received: 3 February 2020
Accepted: 30 March 2020
First Online: 7 April 2020
Ethics approval and consent to participate
: This retrospective review of the clinical charts was approved by the Institutional Review Board of Kitasato University Hospital (B18–0254), and followed the tenets of the Declaration of Helsinki. Our Institutional Review Board waived the requirement for informed consent for this retrospective study.
: Not applicable.
: The authors have declared that no competing interests exist.