Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (GR2684/5-1)
Article History
Received: 18 July 2018
Accepted: 18 November 2018
First Online: 28 November 2018
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 Osnabrück University and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was reviewed and approved by the local ethics committee of Osnabrück University.
: Informed consent was obtained from all individual participants included in the study.