1. Department of Pathology; University Medical Center Utrecht; Utrecht The Netherlands
2. Department of Pathology; Leiden University Medical Center; Leiden The Netherlands
3. Department of Molecular Cell Biology; Leiden University Medical Center; Leiden The Netherlands
4. External consultant at the Department of Pathology; Rizzoli Institute and University of Bologna; Bologna Italy
5. Department of Pathology; University Hospitals Leuven; Leuven Belgium
6. Department of Pathology; Memorial Sloan-Kettering Cancer Center; New York NY, USA