1 Department of Pediatrics, Duke University Medical Center, Durham, NC, USA. sarah.hart@duke.edu.
2 Department of Pediatrics, Duke University Medical Center, Durham, NC, USA.
3 Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA.
4 Down Syndrome Center of Western Pennsylvania, University of Pittsburgh Medical Center Children's Hospital of Pittsburgh, Pittsburgh, PA, USA.
5 Laboratory of Molecular Genetics and Functional Genomics, Division of Genetic and Rare Disease, Bambino Gesù Children's Hospital and Research Institute, Rome, Italy.
6 Down Syndrome Program, Division of Medical Genetics and Metabolism, Department of Pediatrics, Massachusetts General Hospital, Rome, Italy.
7 Department of Pediatrics, Bambino Gesù Children's Hospital and Research Institute, Rome, Italy.
8 Division of Genetics, Nationwide Children's Hospital, Columbus, OH, USA.
9 Department of Pediatrics, Harvard Medical School, Boston, MA, USA.