1. Ergonomics and Aerosol Technology, Lund University, Lund, Sweden
2. Division of Occupational and Environmental Medicine, Department of Laboratory Medicine, Lund University, Lund, Sweden
3. Section of Occupational and Environmental Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
4. Unit of Occupational Medicine, Institute of Environmental Medicine, Karolinska Institute, Solnavägen, Stockholm, Sweden