[1] HARVARD UNIV,CHILDRENS HOSP,DEPT CARDIOL,BOSTON,MA 02115
[2] HARVARD UNIV,SCH MED,DEPT PEDIAT,BOSTON,MA 02115
[3] YALE UNIV,SCH MED,DEPT CELL BIOL,NEW HAVEN,CT 06510
[4] HARVARD UNIV,SCH MED,DEPT PHYSIOL & BIOPHYS,BOSTON,MA 02115
[5] HARVARD UNIV,SCH MED,HOWARD HUGHES MED INST,MOLEC & CELLULAR CARDIOL LAB,BOSTON,MA 02115