By the numbers. Top vendors of acute-care EHR systems. Based on total number of installations at U.S. hospitals from January 2008 to January 2009.
D003132:Commerce / Q000145:classification*; D006751:Hospital Information Systems / Q000706:statistics & numerical data*; D016347:Medical Records Systems, Computerized / Q000706:statistics & numerical data*; D014481:United States