Response to Letter to the Editor by Palffy and Ghaziuddin

Affiliations

• ¹ Down Syndrome Program, Division of Medical Genetics and Metabolism, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, USA.
• ² Department of Pediatrics, Harvard Medical School, Boston, Massachusetts, USA.
• ³ Department of Neurology, Harvard Medical School, Boston, Massachusetts, USA.
• ⁴ Boston Children's Hospital Down Syndrome Program, Boston Children's Hospital, Boston, Massachusetts, USA.
• ⁵ Geisinger Health System, Danville, Pennsylvania, USA.
• ⁶ Mater Research Institute-University of Queensland, The University of Queensland, South Brisbane, Australia.
• ⁷ Department of Pediatrics, Duke University Medical Center, Durham, North Carolina, USA.
• ⁸ Biostatistics Center, Massachusetts General Hospital, Boston, Massachusetts, USA.
• ⁹ Down Syndrome Center of Western Pennsylvania, UPMC Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA.
• ¹⁰ Pediatric and Infectious Disease Unit, Bambino Gesù Children's Hospital, Rome, Italy.