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Trends in hospital emergency department utilization : United States, 1992-99.

Burt, Catharine W.
Hyattsville, Md. : Dept. of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics ; Washington, DC : For sale by the U.S. G.P.O., Supt. of Docs., [2001] 2001

Trends in hospital emergency department utilization : United States, 1992-99.

Burt, Catharine W.
Hyattsville, Md. : Dept. of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics ; Washington, DC : For sale by the U.S. G.P.O., Supt. of Docs., [2001] 2001