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Except in the rare case of coexisting ectopic and intrauterine pregnancies, the identification of chorionic villi in uterine contents essentially eliminates the diagnosis of ectopic pregnancy.
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BabyCenter on MSNScience fact, not fiction: How twins can have different biological fathersFraternal twins already look different from one another, since they are born from two different eggs fertilized with two different sperm, so there's no quick way to determine if they're from different ...
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