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crowson et al. comorbidity clusters in ra predict mortality. look at cluster 4! this is older patients with 6+ comorbidities who were more likely to have smoked. smrs, c1 0.8, c2 1.6, c3 1.2, c4 3.5 #acr22 abstr#246 
Rheumatologist @stjamesdublin , Associate Professor @tcddublin , Acute Medicine, Vasculitis, ILD, Retired @Emeunet Executive Committee member, @rheum_covid CASC