1. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
2. Section of Occupational and Environmental Medicine, University Hospital of Lund, Sweden
3. IVL Swedish Environmental Research Institute Ltd., Stockholm, Sweden
4. Division of Laboratory Sciences, National Centre for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
5. Department of Applied Environmental Sciences, Stockholm University, Stockholm, Sweden
6. Swedish Environmental Protection Agency, Stockholm, Sweden