Columbus Children's Hospital, Columbus, Ohio, United States
CHU Timone - Département de cardiologie, Marseille, France
Hospital Gregorio Maranon, Madrid, Spain
Johns Hopkins University, Baltimore, Maryland, United States
SUNY Stony Brook, Stony Brook, New York, United States
Baylor College of Medicine, Houston, Texas, United States
Huntington Memorial Hospital, Pasadena, California, United States
Santa Barbara Cottage Hospital, Santa Barbara, California, United States
Nature Coast Clinical Research, Crystal River, Florida, United States
Hospital General La Fe, Valencia, Spain
The Children's Hospital, Denver, Colorado, United States
Virga Jesse Hospital, Hasselt, Belgium
University of Alberta Hospital, Edmonton, Alberta, Canada
Northwestern University, Chicago, Illinois, United States
New Orleans Center for Clinical Research-Knoxville, Knoxville, Tennessee, United States
Cooper University Hospital, Camden, New Jersey, United States
Huntington Memorial Hospital, Pasadena, California, United States
Physicians Clinical Research Corporation, Laguna Hills, California, United States
Clinique St. Vincent CHC, Rocourt, Belgium
Beatrix Children's Hospital, University Medical Center Groningen, Groningen, Netherlands
Policlinico S. Orsola, Bologna, Italy