1. From the Franz Volhard Clinical Research Center (S.E., M.B., J. Janke, F.C.L., J. Jordan), Medical Faculty of the Charité and Helios Klinikum, Berlin, Germany; Deutsches Zentrum für Luft-und Raumfahrt (P.F., L.B., M.H.), Institute of Aerospace Medicine, Cologne, Germany; and the Department of Nephrology and Hypertension (J.T.), Friedrich-Alexander-University Erlangen, Nürnberg, Germany.