1. Department of Occupational Medicine, and
2. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
3. Division of Occupational and Environmental Medicine, Lund University, Lund, Sweden
4. Department of Occupational and Environmental Medicine, Copenhagen University Hospital, Bispebjerg, Copenhagen, Denmark
5. Danish Center for Neonatal Screening, Department of Clinical Biochemistry and Immunology, Statens Serum Institute, Copenhagen, Denmark
6. School of Biosciences, University of Nottingham, Nottingham, United Kingdom
7. Department of Pediatrics, Regional Hospital of Randers, Randers, Denmark
8. Perinatal Epidemiology Research Unit, Department of Pediatrics, Aarhus University Hospital, Skejby, Denmark