Text and Data Mining valid from 2019-11-27
Received: 9 May 2019
Accepted: 2 October 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: This research was approved by the ethics committee of each participating hospital and the ethics committee of the Nagoya Medical Center Hospital (Institutional Review Board approval number 2018-19).
: Not applicable.
: The authors declare that they have no competing interests.