[1] MedStar Hlth Res Inst, Hlth Care Delivery Res, Hyattsville, MD USA
[2] MedStar Washington Hosp Ctr, Dept Emergency Med, Washington, DC USA
[3] Georgetown Univ, Sch Med, Washington, DC USA
[4] Emory Univ, Dept Emergency Med, Atlanta, GA 30322 USA
[5] MedStar Washington Hosp Ctr, Dept Case Management, Washington, DC USA
[6] Univ Maryland, Sch Med, Dept Emergency Med, Baltimore, MD 21201 USA
[7] Univ Maryland, Hilltop Inst, Baltimore, MD 21201 USA
[8] MedStar Hlth, Qual & Safety, Columbia, MD USA
[9] US Acute Care Solut, Canton, OH USA
[10] Allegheny Hlth Network, Dept Emergency Med, Pittsburgh, PA USA