Influence of Provider Volume and Case-Mix on Risk-Adjusted Performance RankingsP27O’Brien, Sean MDeLong, Elizabeth REdwards, Fred HPeterson, Eric DAuthor informationDuke Univ Med Cntr, Durham, NC (O’Brien, DeLong, Peterson)Univ of Florida, Jacksonville, FL (Edwards)Circulation 113(21):p e792, May 30, 2006.Copyright © 2006 American Heart Association, Inc.