1. Jacobs P, Noseworthy TW. National estimates of intensive care utilization and costs: Canada and the United States. Crit Care Med 1990; 18:1282–1286.
2. Cowan CA, Lazenby HC, Martin AB, et al. National health expenditures, 1999. Health Care Finance Rev 2001;22:77–110.
3. Merrill CT, Elixhauser A. Hospitalization in the United States, 2002. HCUP Fact Book No. 6. Report No. AHRQ, Publication No. 05–0056. Rockville, MD: AHRQ; 2005.
4. Kersten A, Milbrandt EB, Rahim MT, et al. How big is critical care in the US? Crit Care Med 2003;31(Suppl):A8.
5. Rubenfeld GD, Caldwell E, Peabody E, et al. Incidence and outcomes of acute lung injury. N Engl J Med 2005;353:1685–1693.