1. Department of Paediatrics and Adolescent Medicine, The Juliane Marie Centre, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
2. Department of Clinical Microbiology, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
3. Department of Paediatrics and Adolescent Medicine, Nordsjællands Hospital, Hillerød, Denmark
4. Department of Paediatrics and Adolescent Medicine, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark