Text and Data Mining valid from 2020-04-06
Received: 5 January 2020
Accepted: 25 March 2020
First Online: 6 April 2020
Ethics approval and consent to participate
: The institutional Review Board at the International University of Health and Welfare Atami Hospital approved this study, including the request to waive the documentation of informed consent.
: Not applicable.
: The authors declare that they have no competing interests.