1 From the Institute for Aerospace Medicine, German Aerospace Center (DLR), Cologne (J.J., J.T.).
2 Chair for Aerospace Medicine University of Cologne, Germany (J.J.).
3 University Hypertension Center, University of Cologne, Germany (J.J., J.T. H.R.).
4 Department of Internal Medicine and Cardiology, Ev. Klinikum Köln-Weyertal and Department III of Internal Medicine, Heart Center of the University of Cologne, Cologne, Germany (H.R.).