By the number. Top 25 largest healthcare executive search firms. Ranked by total number of U.S. placements made for senior-level (senior VP and above) healthcare executives in 2009.
D002322:Career Mobility; D004651:Employment / Q000706:statistics & numerical data*; D006270:Health Facility Administrators / Q000706:statistics & numerical data*; D006801:Humans; D010560:Personnel Selection / Q000706:statistics & numerical data*; D014481:United States