1. Faculty of Medicine, University of Helsinki, Helsinki, Finland;
2. Finnish Institute of Occupational Health, Helsinki, Finland;
3. Stora Enso Oyj, Helsinki, Finland;
4. UPM Kymmene Oyj, Helsinki, Finland;
5. Liderstrøm-Lang Centre for Protein Science, Department of Biology, University of Copenhagen, Copenhagen, Denmark;
6. National Research Centre for the Working Environment, Copenhagen, Denmark;
7. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden