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ObjectiveTo examine the distribution of first‐trimester biochemical markers of aneuploidy in twins according to chorionicity.
MethodsMaternal serum free‐β‐human chorionic gonadotropin (hCG) and pregnancy‐associated plasma protein A (PAPP‐A) were measured between 8–13 + 6 weeks as a part of a routine first‐trimester screening program in conjunction with fetal nuchal translucency measured at 11 to 13...