1. Department of Public Health and Clinical Medicine; Division of Occupational and Environmental Medicine/the OLIN unit; Umeå University; Umeå Sweden
2. Department of Health Sciences; Luleå University; Luleå Sweden
3. Department of Public Health and Clinical Medicine; Division of Medicine/the OLIN unit; Umeå University; Umeå Sweden
4. Krefting Research Centre; Institute of Medicine; University of Gothenburg; Gothenburg Sweden