Text and Data Mining valid from 2019-12-01
Received: 23 October 2019
Accepted: 23 November 2019
First Online: 5 December 2019
Ethics approval and consent to participate
: This study was approved by the local ethics committee of Kobe University Hospital (No. 180332).
: The consent to publish was obtained from all participants in this study.
: The authors declare that they have no competing interests.