1. Center of Public Health, Stockholm County Council, Karolinska Institute, Stockholm, Sweden
2. Department of Clinical Epidemiology, Karolinska Institute, Stockholm, Sweden
3. Department of Urology, Karolinska Institute, Huddinge University Hospital, Huddinge, Sweden
4. Center of Public Health, Stockholm County Council, Karolinska Institute, Stockholm, and Research Group for Clinical Epidemiology, Karolinska Institute, Stockholm, Sweden