1 Pediatric Infectious Diseases Unit, Department of Pediatrics, Gregorio Marañón University Hospital, Madrid, Spain, Gregorio Marañón Research Health Institute (IiSGM), Madrid, Spain, Biomedical Research Centre Network for Infectious Diseases (CIBERINFEC), Carlos III Health Institute, Madrid, Spain.
2 Pediatric Radiology Department, Gregorio Marañón University Hospital, Madrid, Spain.
3 Pediatric Infectious Diseases Unit, Department of Pediatrics, Gregorio Marañón University Hospital, Madrid, Spain, Gregorio Marañón Research Health Institute (IiSGM), Madrid, Spain, Biomedical Research Centre Network for Infectious Diseases (CIBERINFEC), Carlos III Health Institute, Madrid, Spain, Complutense University, Madrid, Spain.
4 Pavones Primary Care Health Center, Madrid, Spain.
5 Microbiology and Infectious Diseases Department, Gregorio Marañón University Hospital, Madrid, Spain, Biomedical Research Centre Network for Respiratory Diseases (CIBERES).
6 Pediatric Infectious Diseases Unit, Department of Pediatrics, Gregorio Marañón University Hospital, Madrid, Spain.
7 Epidemiology Department, Comunidad de Madrid, Spain.
8 Pediatric Infectious Diseases Unit, Department of Pediatrics, Gregorio Marañón University Hospital, Madrid, Spain, Gregorio Marañón Research Health Institute (IiSGM), Madrid, Spain.