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Aetiological and prognostic roles of frailty, multimorbidity and socioeconomic characteristics in the development of SARS-CoV-2 health outcomes: protocol for systematic reviews of population-based studies, Makovski, Tatjana T., Ghattas Jinane, Besnard Stephanie Monnier, Ambrozova Monika, Vasinova Barbora, Feteira-Santos Rodrigo, Bezzegh Peter, Bollmann Felipe Ponce, Cottam James, Haneef Romana, et al. , BMJ Open, Oct-11-2023, Volume 12, Issue 11, (2022)\par \par }