1. Department of Medical Sciences Occupational and Environmental Medicine, Dag Hammarsjköldsväg, Uppsala, Sweden
2. Occupational and Environmental Medicine, Akademiska sjukhuset, Dag Hammarsjköldsväg, Uppsala, Sweden
3. National Research Centre for the Working Environmnent, Lersø Parkallé, Copenhagen Ø, Denmark
4. IMM Institute of Environmnental Medicine, Nobels väg, Stockholm, Sweden
5. Centre for Occupational and Environmental Medicine, Solnavägen, Stockholm, Sweden
6. Department of Sports Science and Clinical Biomechanics, University of Odense, Campusvej, Odense, Denmark