[1] COLUMBIA UNIV COLL PHYS & SURG,DIV CIRCULATORY PHYSIOL,NEW YORK,NY
[2] COLUMBIA UNIV COLL PHYS & SURG,CTR HEART FAILURE RES,NEW YORK,NY
[3] UNIV N CAROLINA,COLLABORAT STUDIES COORDINATING CTR,CHAPEL HILL,NC
[4] OHIO STATE UNIV HOSP,COLUMBUS,OH
[5] UNIV SO CALIF,SCH MED,LOS ANGELES,CA
[6] MCMASTER UNIV,HLTH SCI CTR,HAMILTON,ON,CANADA
[7] UNIV CONNECTICUT,CTR HLTH,SCH MED,FARMINGTON,CT
[8] BRIGHAM & WOMENS HOSP,BOSTON,MA
[9] UNIV MICHIGAN,MED CTR,ANN ARBOR,MI
[10] ALBERT EINSTEIN COLL MED,BRONX,NY
[11] MCMASTER UNIV,FACC,HAMILTON,ON,CANADA