1. Department of Surgery; Lund University, Skåne University Hospital; Malmö Sweden
2. Division of Oncology and Pathology, Department of Clinical Sciences; Lund University; Lund Sweden
3. Clinical Trial Unit, Skåne University Hospital; Lund Sweden
4. Department of Clinical Sciences; Skåne University Hospital Malmö Clinical Research Center, Lund University; Malmo Sweden
5. Division of Molecular Genetic Epidemiology; German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580; Heidelberg D-69120 Germany
6. Center for Primary Health Care Research, Lund University; Malmö 205 02 Sweden