1. Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden
2. Center for Epidemiology and Community Medicine, Stockholm County Council, Stockholm, Sweden
3. Swedish Social Insurance Inspectorate, Stockholm, Sweden
4. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
5. Department of Clinical Neuroscience, Karolinska Institutet, Division of Insurance Medicine, Stockholm, Sweden
6. Department of Medical Science, Uppsala University, Uppsala, Sweden