1. Institute of Human Genetics; University Hospital Magdeburg; Germany
2. Department of Medical Genetics; University Medical Center; Utrecht The Netherlands
3. Department of Medical Genetics; T.C. Thompson Children's Hospital; Chattanooga Tennessee
4. IRCCS Casa Sollievo della Sofferenza Hospital; Mendel Laboratory; Rome Italy
5. Bambino Gesù Children Hospital; IRCCS; Rome Italy
6. Clinical Genetics Unit; Birmingham Women's Healthcare Trust, Birmingham; United Kingdom
7. Departamento de Genetica; Faculdade de Medicina de Ribeirao Preto, Universidade de Sao Paulo; Brazil
8. Clinical Genetics Center; The Children's Hospital of Philadelphia, 34th St. & Civic Center Blvd, Philadelphia; Pennsylvania
9. Northern Genetics Service; Newcastle upon Tyne Hospitals; UK
10. Section of Genomic Medicine; Imperial College London; London UK
11. Institute of Human Genetics; University Hospital Erlangen; Germany