Aortic Stenosis, Subvalvular

• Heartcenter, University Medical Center St. Radboud — Nijmegen, Gelderland, Netherlands

• Poznan Univeristy of Medical Sciences — Poznan, Wielkopolska, Poland

• Children's Cardiomyopathy Foundation — Tenafly, New Jersey, United States

• Henri Mondor Hospital — Créteil, France

• Novosibirsk State Research Institute of Circulation Pathology — Novosibirsk, Russia

• Stanford University — Stanford, California, United States
• University of Michigan Cardiovascular Center — Ann Arbor, Michigan, United States

• Mayo Clinic in Rochester — Rochester, Minnesota, United States

Not specified

• Children's Hospital Colorado — Aurora, Colorado, United States
• University of Miami, Jackson Memorial Hospital — Miami, Florida, United States
• Ann and Robert H. Lurie Children's Hospital of Chicago — Chicago, Illinois, United States
• Children's Hospital Boston — Boston, Massachusetts, United States

• The Cleveland Clinic Foundation — Cleveland, Ohio, United States