Text and Data Mining valid from 2020-03-10
Received: 11 September 2019
Accepted: 19 February 2020
First Online: 10 March 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable.
: The authors declare that there are no conflicts of interest.