1. Division of Molecular Genetic Epidemiology; German Cancer Research Centre (DKFZ); Heidelberg 69120 Germany
2. Center for Primary Health Care Research; Lund University; Malmö Sweden
3. Department of Clinical Sciences; Clinical Research Center, Lund University; Malmö Sweden
4. Department of Plastic and Reconstructive Surgery; Skane University Hospital; Malmö Sweden
5. Department of Medical Biosciences/Pathology; University of Umea; Umea Sweden
6. Cancer Gene Therapy Group, Department of Pathology and Transplantation Laboratory; Haartman Institute, University of Helsinki; Helsinki 00290 Finland