Text and Data Mining valid from 2020-03-06
Received: 10 December 2019
Accepted: 13 February 2020
First Online: 6 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. Informed consent was obtained from all individual participants included in the study. This article does not contain any studies with animals performed by any of the authors.
: Not applicable
: All authors declare that they have no competing interests.