1. Paediatric Research Group; Faculty of Health Sciences; University of Tromsø; Tromsø; Norway
2. Department of Medical Biochemistry; University Hospital of North Norway; Tromsø; Norway
3. Institut für Medizinische Mikrobiologie, Virologie und Hygiene; Universitätsklinikum Hamburg-Eppendorf; Hamburg; Germany
4. UMT 08; Universite du Littoral-cote d'Opale; Univ. Lille-Nord de France; Boulogne-sur-Mer; France