Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (310030E-147628 / 1)
Article History
Accepted: 20 March 2017
First Online: 25 April 2017
Compliance with ethical standards
:
: This research work was funded by the SNF (Swiss National Science Foundation, project 310030E-147,628 / 1).
: The authors declare that they have no conflict of interests. Ethical approval: 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: Informed consent was obtained from all individual participants included in the study.