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Chatzilena, Anastasia, et al. "Effectiveness of BNT162b2 COVID-19 Vaccination in Prevention of Hospitalisations and Severe Disease in Adults with SARS-CoV-2 Delta (B.1.617.2) and Omicron (B.1.1.529) Variant Between June 2021 and July 2022: A Prospective Test Negative Case–control StudyResearch in Context." The Lancet Regional Health. Europe 25, no. 100552- (2023). https://doi.org/10.1016/j.lanepe.2022.100552.

Chatzilena, Anastasia, et al. "Effectiveness of BNT162b2 COVID-19 Vaccination in Prevention of Hospitalisations and Severe Disease in Adults with SARS-CoV-2 Delta (B.1.617.2) and Omicron (B.1.1.529) Variant Between June 2021 and July 2022: A Prospective Test Negative Case–control StudyResearch in Context." The Lancet Regional Health. Europe, vol. 25, no. 100552-, 2023, https://doi.org/10.1016/j.lanepe.2022.100552.