1 University of Basel Children's Hospital Basel, Infectious Diseases Unit and Paediatric Pharmacology, Basel, Switzerland.
2 Department of Paediatric Pneumology, Children's Hospital, Ruhr University of Bochum, Bochum, Germany.
3 Laboratorio de InmunoBiología Molecular, Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain.
4 Academic Unit of Clinical and Experimental Sciences, Faculty of Medicine and Global Health Research Institute, University of Southampton, Southampton, UK.
5 Academic Department of Paediatrics, Faculty of Medicine, Imperial College, London SW7 2AZ, UK. Electronic address: b.kampmann@imperial.ac.uk.