Affiliations

• ¹ Seattle Children's Hospital/University of Washington, Seattle, Washington.
• ² The Children's Heart Clinic, Children's Minnesota, Minneapolis, Minnesota.
• ³ Children's National Hospital, Washington, District of Columbia.
• ⁴ Hospital for Sick Children, Toronto, Ontario, Canada.
• ⁵ Stanford University, Palo Alto, California.
• ⁶ University of Utah, Salt Lake City, Utah.
• ⁷ University of California, San Francisco, San Francisco, California.
• ⁸ Division of Cardiology, Department of Pediatrics, Texas Children's Hospital and Baylor College of Medicine, Houston, Texas.