Rudi, David
Kiefer, Peter
Giannopoulos, Ioannis
Raubal, Martin
Funding for this research was provided by:
Federal Office of Civil Aviation Switzerland (2014-142)
Article History
Received: 10 September 2018
Accepted: 10 July 2019
First Online: 19 July 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Study approved by ETH ethics committee (EK 2016-N-31). Participation was voluntary. Informed consents exist.