1 Department of Anaesthesiology and Intensive Care Medicine, Merheim Medical Center, Hospitals of Cologne, University of Witten/Herdecke, Cologne, Germany.
2 German Aerospace Center (DLR), Institute of Aerospace Medicine, Cologne, Germany.
3 Department of Anaesthesiology, Medical Faculty, University Hospital RWTH Aachen, Aachen, Germany.
4 Institute for Occupational, Social and Environmental Medicine, Medical Faculty, University Hospital RWTH Aachen, Aachen, Germany.
5 Chair of Aerospace Medicine, Medical Faculty, University of Cologne, Cologne, Germany.