Funding for this research was provided by:
German Federal Ministry for Economic Affairs and Energy (ZIM KF3177601KJ3)
Text and Data Mining valid from 2018-02-01
Received: 20 July 2017
Accepted: 1 January 2018
First Online: 1 February 2018
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.