1. Department of Pediatrics; Kolding Hospital; Kolding Denmark
2. Institute of Regional Health Research; University of Southern Denmark; Odense Denmark
3. Allergy Centre and Department of Dermatology; Odense University Hospital; Odense C Denmark
4. Department of Pediatrics; 460, Copenhagen University Hospital; Hvidovre Denmark
5. Research Unit Women's and Childrens' Health; The Department of Pediatrics and Adolescent Medicine; Juliane Marie Centre; Rigshospitalet; Copenhagen University Hospital; Copenhagen Ø Denmark
6. Research Centre for Vitamins and Vaccines (CVIVA); Bandim Health Project; Statens Serum Institut; Copenhagen S Denmark
7. Section of Biostatistics; University of Copenhagen; Copenhagen Denmark
8. Bandim Health Project; Statens Serum Institut; Copenhagen S Denmark
9. Department of Obstetrics and Gynecology; Odense University Hospital; Odense C Denmark
10. The Department of Pediatrics and Adolescent Medicine; Juliane Marie Centre; Rigshospitalet; Copenhagen University Hospital; Copenhagen Ø Denmark
11. Research Centre for Vitamins and Vaccines (CVIVA); Statens Serum Institut; Copenhagen S Denmark
12. OPEN, Institute of Clinical Research; University of Southern Denmark/Odense University Hospital; Odense Denmark