Funding for this research was provided by:
Deutsches Zentrum für Luft- und Raumfahrt (50WB1622, 50WB1317)
Text and Data Mining valid from 2019-04-16
Received: 9 January 2019
Accepted: 18 March 2019
First Online: 16 April 2019
Ethics approval and consent to participate
: The participation in the study was voluntary and every subject gave its written informed consent which was approved by the Ethical Board of the University of Munich, Germany (Reference Nr.: 332-08, 524-15). During the whole season, they retained the right to end their participation without any explanation. Applied procedures and techniques were performed in accordance to the Declaration of Helsinki and met the criteria of standard laboratory guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.
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