1. Division of Urology, Seinäjoki Central Hospital, Seinäjoki, Department of Urology, Helsinki University Hospital, Helsinki, Department of Urology, Tampere University Hospital and Medical School and School of Public Health, University of Tampere, Tampere, Department of Urology, Kuopio University Hospital, Kuopio and Division of Urology, Päijät-Häme Central Hospital, Lahti, Finland