[1] University of Iceland,Centre of Public Health Sciences
[2] National University Hospital,Division of Clinical Cancer Epidemiology, Department of Oncology, Institute of Clinical Sciences
[3] University of Iceland,Karolinska Institute, Departments of Public Health Sciences and Oncology
[4] Sahlgrenska Academy,Pathology
[5] University of Gothenburg,undefined
[6] Sahlgrenska University Hospital SE,undefined
[7] & Centre for Epidemiology and Community Medicine,undefined
[8] Stockholm County Council Health Services,undefined
[9] Reykjavík University,undefined