evidence: Effects of face masks on oxygen saturation at graded exercise intensities - PMID: 36259531 - DOI: 10.1515/jom-2022-0132 Effects of face masks on oxygen saturation at graded exercise intensities [...] Evaluation of the effects on SpO2 of N95 mask (FFP2) on dental health care providers: a cross-sectional observational study.BMC Health Serv Res. 2022 Feb 24;22(1):248. doi: 10.1186/s12913-022-07648-5. BMC Health Serv Res. 2022. PMID: 35209892 Free PMC article.