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Meta-analysis with a dominant model (DD + ID versus II allele) and fixed-effects for the association between RPL risk and the ACE D/I polymorphism. The name of the first author and year of publication for each study was shown. The race subgroups were divided into Caucasian and Asian. For each continent and race comparison the OR and accompanying 95% CI are revealed to show the association of the ACE D/I polymorphism with RPL. The result was showed after sensitivity analysis
