@article{Graciano20211 title = "Validity of PIRO Score as an Assessment Tool for Mortality Risk of COVID-19 Pneumonia among Patients Admitted to World Citi Medical Center from March to August 2020. A Retrospective Observational Cohort Study", journal = "International Journal of Coronaviruses", volume = "3", number = "4", pages = "1 - 9", year = "2021", note = "", issn = "2692-1537", doi = "https://doi.org/10.14302/issn.2692-1537.ijcv-21-4045", url = "https://openaccesspub.orgijcv/article/1747", author = "D. Natividad III Graciano and Pastrana Edmart and PiƱera Rizalyn", keywords = "COVID-19", keywords = "PIRO", keywords = "Pneumonia" }