Text and Data Mining valid from 2019-04-24
Received: 20 November 2018
Accepted: 2 April 2019
First Online: 24 April 2019
Compliance with Ethical Standards
: No funding was received.
: All authors have no conflicts of interest or financial ties to disclose.
: 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.