Multimorbidity and frailty are associated with poorer SARS-CoV-2-related outcomes: systematic review of population-based studies, Makovski, Tatjana T., Ghattas Jinane, Monnier-Besnard Stéphanie, Cavillot Lisa, Ambrozova Monika, Vasinova Barbora, Feteira-Santos Rodrigo, Bezzegh Peter, Bollmann Felipe Ponce, Cottam James, et al. , Aging Clinical and Experimental Research, Jan-12-2024, Volume 36, Issue 1, (2024)