1. Department of Pediatrics; Duke University Medical Center; Durham North Carolina
2. F. Hoffmann-La Roche; Roche Pharma Research and Early Development; Neuroscience, Roche Innovation Center New York; New York New York
3. Department of Neurology; Boston Children's Hospital; Boston Massachusetts
4. Down Syndrome Program, Developmental Medicine Center; Boston Children's Hospital; Boston Massachusetts
5. Harvard Medical School; Boston Massachusetts
6. F. Hoffmann-La Roche; Roche Pharma Research and Early Development; Neuroscience, Roche Innovation Center Basel; Basel Switzerland
7. Down Syndrome Program, Division of Medical Genetics, Department of Pediatrics; Massachusetts General Hospital; Boston Massachusetts
8. Section of Developmental-Behavioral Pediatrics; Department of Pediatrics, Rush University Medical Center; Chicago Illinois
9. Department of Psychiatry and Behavioral Sciences; Duke University Medical Center; Durham North Carolina