1. Unité De Génétique Du Cancer, Service De Génétique Médicale; Centre Hospitalier Universitaire Vaudois; Lausanne CH-1011 Switzerland
2. Cytogenomics Laboratory, NIMGenetics; Madrid Spain
3. Cytogenetic External Quality Assessment, Women's Centre, John Radcliffe Hospital; Oxford University Hospitals NHS Trust; Oxford UK
4. Institut De Pathologie Et De Génétique; Gosselies Belgium
5. West Midland Regional Genetic Laboratory; Birmingham Womens Hospital; Birmingham UK
6. Dept Genet; University Groningen, University Medical Centre Groningen; Groningen the Netherlands
7. Department of Clinical Genetics; Erasmus Medical Centre; Rotterdam the Netherlands
8. Department of Human Genetics; Radboud University Medical Centre; Nijmegen the Netherlands