Vilaça, C., Fidalgo, C., Leite, A., & Oliveira, N. (2014). Community acquired pneumonia and pneumonia severity index 20 (PSI-20): a retrospective study of the patients admitted to an internal medicine service, between 2007 and 2008. Internal Medicine, 21(2), 53–60. https://doi.org/10.24950/rspmi.989