1. Department of Surgical Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
2. Department of Pathology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
3. Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
4. Department of Endocrinology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.