1. Department of Emergency Medicine; Beth Israel Deaconess Medical Center; Boston Massachusetts
2. Division of Critical Care; Department of Anesthesia Critical Care; Beth Israel Deaconess Medical Center; Boston Massachusetts
3. Research Center for Emergency Medicine; Aarhus University Hospital; Aarhus Denmark
4. Division of Pulmonary Critical Care & Sleep Medicine; Department of Medicine; Beth Israel Deaconess Medical Center; Boston Massachusetts