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" ... Researchers at the Massachusetts General Hospital in Boston performed a systematic review and meta-analysis of observational studies utilizing CT or MRI that examined the prevalence of silent cerebral infarctions (SCIs) in 505 people with AF and 3,902 in people without AF. (Earlier studies using autopsies were discarded because of their low quality.) Patients with AF had more than a two-fold increase in risk. SCIs were found in 45.4% of people with AF compared with 15.63% of people without AF (Odds Ratio 2.62; CI 1.81 - 3.80). ... "