1. Division of Medical Genetics and Metabolism Massachusetts General Hospital Boston Massachusetts USA
2. Department of Pediatrics Harvard Medical School Boston Massachusetts USA
3. Advocate Medical Group Adult Down Syndrome Center Park Ridge Illinois USA
4. Division of Child Neurology Duke University Medical Center Durham North Carolina USA
5. Department of Medicine Baylor College of Medicine Houston Texas USA
6. Department of Family and Community Medicine Baylor College of Medicine Houston Texas USA
7. Department of Family and Community Medicine Thomas Jefferson University Philadelphia Pennsylvania USA
8. Division of General Internal Medicine The University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
9. Kennedy Krieger Institute Baltimore Maryland USA