Text and Data Mining valid from 2020-01-07
Received: 30 November 2019
Accepted: 30 December 2019
First Online: 7 January 2020
Ethics approval and consent to participate
: This study was approved by the local ethics committee of Kobe University Hospital (No. B190231).
: The consent to publish was obtained from all participants in this study.
: The authors declare that they have no competing interests.