1. The OLIN‐studiesNorrbotten County CouncilS‐971 89LuleåSweden
2. Department of Public Health and Clinical MedicineOccupational and Environmental MedicineUmeå UniversityS‐901 87UmeåSweden
3. Krefting Research CentreInstitute of Medicine, The Sahlgrenska AcademyUniversity of GothenburgS‐405 30GothenburgSweden