1. Department of Surgery; Erasmus Medical Centre; Rotterdam The Netherlands
2. Department of Surgery; Kennemer Gasthuis Hospital; Haarlem The Netherlands
3. Department of Pathology; VU University Medical Centre; Amsterdam The Netherlands
4. Department of Pathology; Kennemer Gasthuis Hospital; Haarlem The Netherlands
5. Departments of Epidemiology and Biostatistics; VU University Medical Centre; Amsterdam The Netherlands