1. German Air Force Center of Aerospace Medicine, Fürstenfeldbruck, Germany.
2. German Aerospace Center (DLR), Institute of Aerospace Medicine, Cologne, Germany.
3. Institute of Aerospace Medicine, University of Cologne, Cologne, Germany.
4. Department of Anesthesiology and Intensive Care Medicine, Merheim Medical Center, Hospitals of Cologne, University of Witten/Herdecke, Cologne, Germany.