1. School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
2. London School of Hygiene and Tropical Medicine, London, UK
3. Division of Occupational and Environmental Medicine, Department of Laboratory Medicine, Lund University, Lund, Sweden
4. Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden
5. Swedish Environmental Protection Agency, Stockholm, Sweden
6. Department of Occupational and Environmental Medicine, Sahlgrenska University Hospital, Gothenburg, Sweden