1. Gun M. Nordström, Department of Urology, Södersjukhuset, Stockholm, Address for off-prints: Gun Nordström, Department of Urology, Södersjukhuset, Box 38100, 10064 Stockholm, Sweden
2. Department of Urology, Södersjukhuset, Stockholm
3. The National Institute of Psychosocial Factors and Health, Stockholm, Sweden