1. Institute of Human Genetics; University of Ulm; Ulm Germany
2. Medical Genomics Laboratory; Department of Genetics; University of Alabama at Birmingham; Birmingham Alabama
3. Cytogenetics Laboratory; Department of Genetics; University of Alabama at Birmingham; Birmingham Alabama
4. Division of Human Genetics; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio
5. Louisiana State University Health Sciences Center and Children's Hospital; New Orleans Louisiana
6. Institute of Medical Genetics; School of Medicine; Cardiff University; Cardiff UK