1. Department of Pediatrics, Institute for Medical Microbiology and Hospital Epidemiology, Hannover Medical School, Hannover, Germany;
2. Department of Pediatrics, University Children's Hospital Heidelberg, Heidelberg, Germany;
3. Department of Pediatrics, University Children's Hospital Greifswald, Greifswald, Germany;
4. Department of Pediatrics, University Children's Hospital, University Witten/Herdecke, Witten, Germany;
5. Department of Pediatrics, University Children's Hospital Dresden, Dresden, Germany;
6. Department of General Pediatrics, University Children's Hospital. Düsseldorf, Germany;
7. Department of Pediatrics, University Children's Hospital Ulm, Ulm, Germany; and
8. Department of Center for Biometry, Medical Informatics and Medical Technology, Institute for Biometry, Institute for Biometrics, Hannover Medical School, Hannover, Germany