1. Centre for Medical Image Computing; University College London; WC1E 6BT London UK
2. Diagnostic Image Analysis Group; Radboud University Medical Center; 6500 HB Nijmegen The Netherlands
3. Department of Pathology; Radboud University Medical Center; 6500 HB Nijmegen The Netherlands
4. Department of Radiology; Radboud University Medical Center; 6500 HB Nijmegen The Netherlands