Text and Data Mining valid from 2020-03-26
Received: 23 January 2020
Accepted: 12 March 2020
First Online: 26 March 2020
Ethics approval and consent to participate
: The study was approved by the Tokushukai Group Joint Ethics Committee (reference number TGE00947-024) and conducted in adherence with the tenets of the Declaration of Helsinki. Informed consent from individual patients was waived because all data were anonymized for research purposes.
: Not applicable.
: The authors declare that they have no competing interests.