1. Department of Internal Medicine III, Division of Cardiology, Pneumology, Angiology, and Intensive Care (J.-N.H., F.H., T.K., S.B.), University of Cologne, Germany.
2. German Aerospace Center, Institute of Aerospace Medicine, Cologne, Germany (J.-N.H., D.G., F.H., T.K., H.W., C.E.H., B.K., J.J., J.T., U.L.).
3. Department of Nuclear Medicine, Faculty of Medicine and University Hospital Cologne (H.W.), University of Cologne, Germany.
4. Division of Cardiology, Department of Internal Medicine (V.G.Z., H.A.S., B.D.L.), UT Southwestern Medical Center, Dallas, TX.
5. Advanced Imaging Research Center (V.G.Z.), UT Southwestern Medical Center, Dallas, TX.
6. Center for Regenerative Science and Medicine (H.A.S.), UT Southwestern Medical Center, Dallas, TX.
7. Laboratory Medicine, Radboud University Medical Center, Nijmegen, the Netherlands (A.E.v.H., A.J.O.).
8. Cardiology Department, EVK Weyertal, Cologne, Germany (H.R.).
9. Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas (B.D.L.).
10. Head of Aerospace Medicine, University of Cologne, Germany (J.J.).
11. Department of Anesthesiology and Intensive Care Medicine, Merheim Medical Center, Hospitals of Cologne, University of Witten/Herdecke, Germany (U.L.).