Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (TH 1554/3-1)
Article History
Received: 12 July 2018
Accepted: 15 February 2019
First Online: 25 February 2019
Compliance with ethical standards
:
: The authors declare that they have 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.