1. Infectious Diseases Department, São João University Hospital Center, Porto, Portugal
2. Faculty of Medicine, University of Porto, Porto, Portugal
3. Clinical Research/epidemiology in Pneumonia & Sepsis (CRIPS), Vall d’Hebron Institute of Research (VHIR), Barcelona, Spain
4. Centro de Investigación Biomédica en Red de Enfermidades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain