1. Department of Cardiovascular Medicine (I.M., A.J.S., N.A.H., Z.S.), University of Kansas Health System, University of Kansas School of Medicine, Kansas City.
2. Division of Cardiothoracic Surgery (J.E.T.), Department of Surgery, University of Utah Health, Salt Lake City.
3. Division of Emergency Medicine (J.E.T.), Department of Surgery, University of Utah Health, Salt Lake City.
4. Department of Biostatistics (J.H., Y.W.), University of Kansas Health System, University of Kansas School of Medicine, Kansas City.
5. Extracorporeal Life Support Organization, Ann Arbor, MI (P.R.).
6. Department of Anesthesiology (W.J.W.), University of Kansas Health System, University of Kansas School of Medicine, Kansas City.
7. Department of Cardiothoracic Surgery (T.O.A., M.R.D.), University of Kansas Health System, University of Kansas School of Medicine, Kansas City.
8. Division of Cardiology, Department of Medicine, Medical University of South Carolina, Charleston (R.J.T.).
9. Division of Cardiovascular Medicine, University of Utah, Salt Lake City (J.C.F.).