1. Juliana Children's Hospital, Haga Teaching Hospital Den Haag The Netherlands
2. Department of Pediatrics Reinier de Graaf Ziekenhuis Delft The Netherlands
3. Department of Pediatrics Spaarne Gasthuis Haarlem The Netherlands
4. Department of Pediatrics Haaglanden Medical Centre Den Haag The Netherlands
5. Department of Pediatrics Franciscus Gasthuis & Vlietland Rotterdam The Netherlands
6. Department of Medical Microbiology and Infection Prevention Groene Hart Ziekenhuis Gouda The Netherlands
7. Department of Pediatrics Isala ziekenhuis Zwolle The Netherlands
8. Department of Pediatrics St. Antonius Ziekenhuis Utrecht The Netherlands
9. Department of Pediatrics Maastricht University Medical Centre Maastricht The Netherlands