Funding for this research was provided by:
Deutsches Zentrum für Luft- und Raumfahrt (50WB1426)
Article History
Received: 5 December 2017
Accepted: 8 June 2018
First Online: 26 June 2018
Compliance with Ethical Standards
:
: No conflict of interest, financial or otherwise, are declared by the authors.
: 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.