1. Department of Paediatric Pulmonology and Sleep Medicine, Children’s Hospital, University of Duisburg-Essen, Essen, Germany
2. Department of Paediatric Infectious Diseases, Children’s Hospital, University of Duisburg-Essen, Essen, Germany
3. Institute of Medical Microbiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany