[1
]
Division of Pediatric Cardiology, Children's Hospital Los Angeles, University of Southern
California Keck School of Medicine, Los Angeles, Calif.
[2
]
University of Southern California Keck School of Medicine, Los Angeles, Calif.
[3
]
Division of Cardiovascular Surgery, Children's Hospital Los Angeles, University of
Southern California Keck School of Medicine, Los Angeles, Calif.
[4
]
Division of Pediatric Cardiology, Children's Hospital Los Angeles, University of Southern
California Keck School of Medicine, Los Angeles, Calif. Electronic address: acheng@chla.usc.edu.