Text and Data Mining valid from 2020-04-07
Received: 7 December 2019
Accepted: 27 March 2020
First Online: 7 April 2020
Ethics approval and consent to participate
: This study has been reviewed by the appropriate ethics committee of our hospital and have been performed in accordance with the ethical standards laid down in an appropriate version of the 1964 Declaration of Helsinki.
: Not applicable
: The authors declare that they have no competing interests