Study to Evaluate the Safety of Twice Daily Oral Carvedilol

Children's Hospital of Philadelphia, Philadelphia

University of Miami, Miami

Vanderbilt Children's Hospital, Nashville

C.S. Mott Children's Hospital, Ann Arbor

Children's Memorial Hospital, Chicago

Texas Children's Hospital, Houston

University of Colorado, Denver

University of Utah, Salt Lake City

Mattel Children's Hospital at UCLA, Los Angeles

Children's Hospital Los Angeles, Los Angeles

Stanford University, Palo Alto

Seattle Childrens Hospital and Regional Medical Center, Seattle

Children's Hospital, Boston, Boston

Children's Hospital of Michigan, Detroit

Washington University, St Louis

Columbia University, New York

UT Southwestern Medical Center, Dallas