1. Department of Occupational Medicine, Hospital of South West Jutland, University Hospital of Southern Denmark, Finsensgade, Esbjerg, Denmark
2. Department of Public Health, Section of Environment, Occupation and Health, Danish Ramazzini Centre, Aarhus University, Bartholins Alle, Aarhus C, Denmark
3. National Research Centre for the Working Environment, Lersø Parkalle, Copenhagen Ø, Denmark