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Meta-analyses of the association between the use of BBs, NBBs, SBBs, and PD. The square represents the results of a single study. The small diamond at the bottom of the forest plot represents the pooled RR, and its width represents the 95%CI. BB, beta-adrenoceptor blocker; NBB, nonselective beta-adrenoceptor blockers; SBB, selective beta-1 receptor antagonist; PD, Parkinson’s disease; CI, confidence interval; REML, Restricted Maximum Likelihood
