1. Department of Occupational Medicine, University Research Clinic, Danish Ramazzini Centre, Gødstrup Hospital , Herning, Denmark
2. Department of Psychology and Behavioral Sciences, Aarhus University , Aarhus C, Denmark
3. Department of Occupational Medicine, Danish Ramazzini Centre, Aarhus University Hospital , Aarhus N, Denmark
4. Department of Occupational and Environmental Medicine, Danish Ramazzini Centre, Aalborg University Hospital , Aalborg, Denmark
5. Department of Clinical Medicine, Aarhus University , Aarhus N, Denmark
6. Elective Surgery Centre, Silkeborg Regional Hospital , Silkeborg, Denmark
7. Centre for Research in Health and Nursing, Research, Regional Hospital Central Jutland , Viborg, Denmark