1. Department of Pediatrics and Adolescent Medicine , University Hospital Erlangen , Loschgestr. 15 , 91054 Erlangen , Germany , Phone: +49 9131/85-33731, Fax: +49 9131/85-35742
2. Chair of Medical Informatics , Friedrich-Alexander-University Erlangen-Nuremberg , Erlangen , Germany
3. Department of Statistics , University of Bremen , Bremen , Germany
4. Bremer Zentrum für Laboratoriumsmedizin , Klinikum Bremen Mitte , Bremen , Germany
5. MVZ wagnerstibbe, amedes Gruppe , Hannover , Germany
6. Department of Pediatrics and Adolescent Medicine , University Medical Center Ulm , Ulm , Germany
7. Department of Pediatric Oncology/Hematology , Klinikum Augsburg , Augsburg , Germany
8. Core Facility of Clinical Chemistry , University Medical Center Ulm , Ulm , Germany
9. Department of Transfusion Medicine and Haemostasis , Klinikum Augsburg , Augsburg , Germany
10. Central Laboratory , Gesundheit Nord – Bremen Hospital Group , Bremen , Germany
11. Institute for Laboratory Medicine and Microbiology , Klinikum Augsburg , Augsburg , Germany
12. Institute of Clinical Chemistry, Hannover Medical School , Hannover , Germany
13. MVZ Labor PD Dr. Volkmann und Kollegen , Karlsruhe , Germany
14. Division of Laboratory Medicine , University Hospital of Würzburg , Würzburg , Germany
15. Division of Pediatric Hematology and Oncology, Department of Pediatrics and Adolescent Medicine , University of Freiburg , Freiburg , Germany
16. Department of Epidemiology & International Public Health, School of Public Health , Bielefeld University , Bielefeld , Germany
17. Department of Clinical Chemistry , University Hospital of Cologne , Cologne , Germany
18. Institute of Clinical Chemistry , University Hospital Schleswig-Holstein, Campus Kiel , Kiel , Germany
19. Department of Pediatrics and Adolescent Medicine , University Hospital Erlangen , Erlangen , Germany