1. Perinatal Epidemiology Research Unit, Aarhus University Hospital, Skejby, Denmark;
2. Horsens Regional Hospital, Horsens, Denmark;
3. Danish Ramazzini Center, Department of Occupational Medicine, Aarhus University Hospital, Aarhus, Denmark;
4. Department of Public Health, Section for Environment, Occupation and Health, Danish Ramazzini Centre, Aarhus University, Aarhus, Denmark;
5. Department of Occupational and Environmental Medicine, Bispebjerg Hospital, Copenhagen University Hospital, Copenhagen, Denmark;
6. Department of Pediatrics, Aarhus University Hospital, Skejby, Denmark;
7. Department of Clinical Epidemiology, Aarhus University Hospital, Denmark