Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (148493)
Text and Data Mining valid from 2018-07-25
Received: 3 May 2018
Revised: 9 July 2018
Accepted: 19 July 2018
First Online: 25 July 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.
: All authors declare that they have no conflict of interest.