1. Department of Public Health and Clinical MedicineEpidemiology and Global Health, Umeå University, Umeå, Sweden
2. Department of Public Health and Clinical MedicineOccupational and Environmental Medicine, Umeå University, Umeå, Sweden
3. Institute of Environmental MedicineKarolinska Institutet, Stockholm, Sweden
4. Centre for Occupational and Environmental Medicine, Stockholm County Council, Stockholm, Sweden