[1] UNIV WISCONSIN,SCH MED,DEPT MED,DIV CARDIOL,MADISON,WI
[2] UNIV WISCONSIN,SCH MED,DEPT SURG,DIV CARDIOTHORAC SURG,MADISON,WI
[3] UNIV WISCONSIN,SCH MED,DEPT PEDIAT,DIV PEDIAT CARDIOL,MADISON,WI
[4] ST LOUIS UNIV,SCH MED,CARDINAL GLENNON CHILDRENS HOSP,DEPT PEDIAT,DIV PEDIAT CARDIOL,ST LOUIS,MO