Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States
Indiana University-Riley Children's Hospital, Indianapolis, Indiana, United States
Children's Hospital Los Angeles, Los Angeles, California, United States
Baylor College of Medicine Heart Clinic, Houston, Texas, United States
Texas Children's Hospital, Houston, Texas, United States
Baylor college of Medicine, Houston, Texas, United States
Baylor College of Medicine, Houston, Texas, United States
Michael E. DeBakey VA Medical Center, Houston, Texas, United States
Saint Petersburg Pavlov State Medical University, Saint Petersburg, Russian Federation
Scott & White Hospital and Clinic, Waco, Texas, United States
George Washington University Medical Center, Washington, D.C., District of Columbia, United States