Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (WE 4105/1-2)
Text and Data Mining valid from 2019-02-02
Received: 19 July 2018
Accepted: 23 January 2019
First Online: 2 February 2019
Compliance with ethical standards
: 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.