1. Paediatric Hematology and Oncology, Children’s Hospital Medical Center, Homburg, Deutschland
2. Otorhinolaryngology, Saarland University Hospital and Saarland University Faculty of Medicine, Homburg, Deutschland
3. Medical Microbiology and Hygiene, Saarland University Medical Center, Homburg, Deutschland
4. Institutes for Medical Biometry, Epidemiology and Medical Informatics (IMBEI), Saarland University, Campus Homburg, Homburg, Deutschland
5. Klinik für Hals-, Nasen- und Ohrenheilkunde, Universitätsklinikum des Saarlandes, Homburg, Deutschland
6. Instituites for Medical Microbiology and Hospital Hygiene, Universitätsklinikum des Saarlandes, Homburg, Deutschland
7. Institues for Medical Microbiology and Hospital Hygiene, Hospital Hygiene and Infection Control, Homburg, Deutschland