1. Department of Surgery, Larner College of Medicine, University of Vermont, Burlington
2. Department of Biochemistry, Larner College of Medicine, University of Vermont, Burlington
3. Division of Oncology and Pathology, Clinical Sciences, Lund University, Lund, Sweden
4. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark
5. Department of Clinical Epidemiology, Aarhus University, Aarhus, Denmark