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(A) Meta-analysis in a random-effects model for AC+CC vs. AA (dominant model). (B) Meta-analysis in a random-effects model for AC vs. AA. (C) Meta-analysis in a random-effects model for CC vs. AA. Each study is shown by the point estimate of the OR (the size of the square is proportional to the weight of each study) and 95% CI for the OR (extending lines).
