The difference between the GnRH-a pretreatment group and control group did not reach statistical significance for live birth rate, and the RR was 1.06 (95% CI 0.71–1.56, I 2 = 74.0%) in the random effects model (Table 4 ).
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Pretreatment with or without GnRH-agonist before frozen-thawed embryo transfer in patients with PCOS: a systematic review and meta-analysis.
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