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Heat maps from 100 bootstrap samples for hierarchical clusters of comorbidities with at least 5% prevalence from the cohorts with rheumatoid arthritis (RA; left panel) and without RA (non-RA; right panel). Abbreviations: BPH=benign prostatic hyperplasia, circ=circulatory, COPD=chronic obstructive pulmonary disease, GERD=gastroesophageal reflux disease, PTSD=post-traumatic stress disorder.
