evidence: Progressive Hypoxia: A Pivotal Pathophysiologic Mechanism of COVID-19 Pneumonia - PMID: 33153625 - PMCID: PMC7524673 - DOI: 10.1016/j.mayocp.2020.09.015 Progressive Hypoxia: A Pivotal Pathophysiologic Mechanism of COVID-19 Pneumonia [...] Early Detection of Silent Hypoxia in Covid-19 Pneumonia Using Smartphone Pulse Oximetry.J Med Syst. 2020 Jun 19;44(8):134. doi: 10.1007/s10916-020-01587-6. J Med Syst. 2020. PMID: 32562006 Free PMC article. No abstract available.