Institution: | ? University of California-San Diego, San Diego, California;† Leiden University Medical Center, Leiden, the Netherlands;‡ University of Minnesota, Minneapolis, Minnesota;§ Stanford University, Stanford, California;∥ Cardiology Section, VA Medical Center, San Diego, California;¶ Division of Cardiology, Johns Hopkins University, Baltimore, Maryland;# Cleveland Clinic, Cleveland, Ohio;?? Pediatric Cardiology, Oregon Health Sciences University, Portland, Oregon |