1. Division of Human Genetics; Cincinnati Children's Hospital; Cincinnati Ohio
2. National Human Genome Research Institute; National Institute of Health; Bethesda Maryland
3. Medical Genetics Institute, Cedars Sinai Medical Center, Division of Medical Genetics, Harbor-UCLA Medical Center; David Geffen School of Medicine at UCLA; Los Angeles California
4. Section of Medical Genetics; Children's Hospital of Wisconsin; Milwaukee Wisconsin
5. Division of Genetics and Genomics; Boston Children's Hospital; Boston Massachusetts
6. Greenwood Genetic Center; Columbia; South Carolina
7. Laboratory of Pathology; National Cancer Institute; National Institute of Health; Bethesda Maryland
8. Division of Medical Genetics and Metabolism; Children's Hospital of The King's Daughters; Norfolk Virginia
9. Clinical Genetics Service; Nottingham University Hospitals Trust; Nottingham United Kingdom