1. Krefting Research Centre; Department of Internal Medicine and Clinical Nutrition; University of Gothenburg; Gothenburg Sweden
2. Department of Public Health and Clinical Medicine; Occupational and Environmental Medicine; the OLIN Unit; Umeå University; Umeå Sweden
3. Mailman School of Public Health; Department of Environmental Health Sciences; Columbia University; New York NY USA
4. Department of Paediatrics; University of Gothenburg; Gothenburg Sweden