1. Department of Public Health and Primary Care, Biomedical Quality Assurance Research UnitUniversity of LeuvenLeuven Belgium
2. Gustave RoussyService de Génétique/Pathologie MoléculaireVillejuif Cedex France
3. Department of Pathology and Department of Human GeneticsRadboud University Medical CenterNijmegen The Netherlands
4. University Medical Center Groningen, Department of PathologyUniversity of GroningenGroningen The Netherlands