1. Department of Paediatrics; St. Olavs Hospital; Trondheim Norway
2. Department of Laboratory Medicine, Children's and Women's Health; Faculty of Medicine; Norwegian University of Science and Technology; Trondheim Norway
3. Center for Biological Sequence Analysis; Technical University of Denmark; Lyngby Denmark
4. Department of Paediatrics and Adolescent Medicine; The University Hospital, Rigshospitalet; Copenhagen Denmark
5. The Institute of Gynaecology, Obstetrics and Paediatrics; The Faculty of Health Sciences; The University of Copenhagen; Copenhagen Denmark