[1] COOK CTY HOSP, DIV CARDIOTHORAC, CHICAGO, IL 60612 USA
[2] COOK CTY HOSP, DIV PEDIAT CARDIOL, CHICAGO, IL 60612 USA
[3] UNIV ILLINOIS, ABRAHAM LINCOLN SCH MED, DIV CARDIOTHORAC, CHICAGO, IL 60612 USA
[4] UNIV ILLINOIS, ABRAHAM LINCOLN SCH MED, DIV PEDIAT CARDIOL, CHICAGO, IL 60612 USA