1Department of Paediatrics, University Hospitals of Gentofte, Denmark
2Department of Odense, University Hospitals of Gentofte, Denmark
3Department of Glostrup, University Hospitals of Gentofte, Denmark
4County Hospital of Nykøbing F, Denmark
5Department of Clinical Immunology, Herlev Hospital, University of Copenhagen, Denmark
Correspondence: HE Nielsen, Department of Paediatrics, University Hospitals of Gentofte, Denmark
Received Feb. 13, 2004; accepted Feb. 25, 2004