Text and Data Mining valid from 2019-03-30
Received: 23 October 2018
Accepted: 19 March 2019
First Online: 30 March 2019
Compliance with ethical standards
: The authors have no conflicts of interest 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.
: Informed consent was obtained from all individual participants included in the study.