1. Division of Clinical Cancer Epidemiology, Department of Oncology, Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden;
2. Department of Oncology and Pathology, Division of Clinical Cancer Epidemiology, Karolinska Institutet, Stockholm, Sweden;
3. Department of Health Care Sciences, Ersta Sköndal Bräcke University College, Stockholm, Sweden;
4. Mathematical Sciences, Chalmers University of Technology and University of Gothenburg, Gothenburg, Sweden