Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (100017_129559)
Text and Data Mining valid from 2019-01-11
Received: 23 May 2018
Accepted: 17 December 2018
First Online: 11 January 2019
Compliance with Ethical Standards
: The author declares that he has no conflict of interest.
: 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.