1. Department of Emergency Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts2Department of Anesthesiology, Aarhus University Hospital, Aarhus, Denmark3Research Center for Emergency Medicine, Aarhus University Hospital, Aarhus, Denmark
2. Division of Cardiac Critical Care, Department of Pediatrics, Medical City Children's Hospital, Dallas, Texas
3. Department of Anesthesiology and Critical Care, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania6Department of Pediatrics, University of Pennsylvania Perelman School of Medicine, Philadelphia7Department of Anesthesiology and Critical Care, University of Pennsylvania Perelman School of Medicine, Philadelphia
4. Department of Emergency Medicine, University of Pennsylvania, Philadelphia9Now with the Department of Emergency Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
5. Institute of Public Health, Charité–Universitätsmedizin Berlin, Berlin, Germany
6. Department of Emergency Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts11Department of Medicine, Division of Pulmonary and Critical Care Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts