[1] University Hospital of North Norway and Institute of Community Medicine,Department of Pediatrics
[2] University of Tromsø,Department of Pediatrics
[3] University Hospital of North Norway,Department of Women's and Children's Health
[4] Institute of Community Medicine,Department of Laboratory Medicine, Children's and Women's Health
[5] University of Tromsø,undefined
[6] Uppsala University Children's Hospital,undefined
[7] Norwegian University of Science and Technology and Department of Pediatrics,undefined
[8] St. Olavs Hospital,undefined