1. Division of Hospital Medicine, Department of Medicine, and Center for Resuscitation Science, Beth Israel Deaconess Medical Center, Boston, Massachusetts (R.D.P.)
2. Center for Resuscitation Science and Department of Emergency Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (L.B., A.V.G., G.T., P.V.P.)
3. Center for Resuscitation Science, Beth Israel Deaconess Medical Center, Boston, Massachusetts, and Research Center for Emergency Medicine, Department of Clinical Medicine, Aarhus University Hospital and Aarhus University, Aarhus, and Department of Anesthesiology and Intensive Care, Randers Regional Hospital, Randers, Denmark (M.J.H.)
4. Center for Resuscitation Science, Beth Israel Deaconess Medical Center, Boston, Massachusetts (M.S.I.)
5. Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (R.K.)
6. Center for Resuscitation Science and Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (K.M.B.)
7. Center for Resuscitation Science and Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, and Division of Critical Care Medicine, Montefiore Medical Center, Bronx, New York (A.M.)
8. Center for Resuscitation Science, Department of Emergency Medicine, and Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (M.W.D.).