[1] Ohio State Univ, Coll Publ Hlth, Div Hlth Serv Management & Policy, Columbus, OH USA
[2] Rush Univ, Med Ctr, Dept Hlth Syst Management, Chicago, IL 60612 USA
[3] AHA, Hlth Res & Educ Trust, Chicago, IL USA
[4] Northwestern Univ, Feinberg Sch Med, Inst Healthcare Studies, Chigaco, IL USA
[5] Northwestern Univ, Feinberg Sch Med, Dept Emergency Med, Chigaco, IL USA
[6] Agcy Healthcare Res & Qual, Ctr Delivery Org & Markets, Washington, DC USA