1. Department of Urology, Örebro University Hospital, Örebro, Sweden
2. Center for Medical Technology Assessment, Linköping University, Linköping, Sweden
3. Channing Laboratory, Department of Medicine, Brigham & Women's Hospital and Harvard Medical School, Boston, USA
4. Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA
5. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden