1. Division of Occupational and Environmental Medicine, Department of Laboratory Medicine, Lund University, Lund, Sweden;
2. Department of Health Sciences, Lund University, Lund, Sweden;
3. Unit of Occupational Medicine, Institute for Environmental Medicine, Karolinska Institute, Stockholm, Sweden;
4. Department of Work Science, Business Economics and Environmental Psychology, Swedish University of Agricultural Sciences, Lund University, Alnarp, Sweden