1. University Clinic Carl Gustav Carus, Department of Pediatrics, Dresden, Germany
2. Institut für Laboratoriumsmedizin und Pathobiochemie, Berlin, Germany
3. The Children’s Memorial Hospital, Chicago, IL
4. Valley Medical Center, Lewiston, ID
5. Department of Pediatrics, Charite, Berlin, Germany
6. Max Planck Institute for Infection Biology, Berlin, Germany
7. Department of Haematology, Technische Universität Dresden, Dresden, Germany
8. Laboratoires Reunis Kutter-Lieners-Hastert, Luxembourg, Luxembourg