1. Division of Pediatric Cardiology, Department of Pediatrics; Johns Hopkins University School of Medicine; Baltimore Maryland
2. Department of Neurology; Boston Children's Hospital; Boston Massachusetts
3. Department of Neurogenetics; Kennedy Krieger Institute; Baltimore Maryland
4. Department of Pediatrics; Johns Hopkins School of Medicine; Baltimore Maryland
5. Department of Neurology; Johns Hopkins University School of Medicine; Baltimore Maryland
6. Autism & Developmental Institute; Geisinger Health System; Lewisburg Pennsylvania
7. Johns Hopkins Biostatistics Center, Department of Biostatistics; Johns Hopkins University Bloomberg School of Public Health; Baltimore Maryland