1. Department of Pediatrics; Jeroen Bosch Hospital; `s-Hertogenbosch The Netherlands
2. Department of Pediatrics; Máxima Medical Centre; Veldhoven The Netherlands
3. Department of Pediatrics; Juliana Children's Hospital/Haga Hospital; The Hague The Netherlands
4. Department of Pediatrics; Gelre Hospital; Zutphen The Netherlands
5. Department of Medical Microbiology; Jeroen Bosch Hospital; ‘s-Hertogenbosch The Netherlands
6. Department of Pediatrics; Slingeland Hospital; Doetinchem The Netherlands
7. Department of Pediatrics; St. Antonius Hospital; Nieuwegein The Netherlands
8. Department of Pediatrics; University of Antwerp; Antwerp University Hospital; Antwerp Belgium
9. Department Epidemiology and Health Monitoring; Robert Koch Institute; Berlin Germany
10. Jeroen Bosch Academy; Jeroen Bosch Hospital; ‘s-Hertogenbosch The Netherlands
11. Department Tranzo; Tilburg University; Tilburg The Netherlands