1 Division of Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany; Center for Primary Health Care Research, Lund University, Malmö, Sweden. Electronic address: k.hemminki@dkfz.de.
2 Cancer Gene Therapy Group, Faculty of Medicine, University of Helsinki, Finland; Helsinki University Hospital Comprehensive Cancer Center, Helsinki, Finland.
3 Division of Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany; Center for Primary Health Care Research, Lund University, Malmö, Sweden.
4 Center for Primary Health Care Research, Lund University, Malmö, Sweden.