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The actual causes are unknown, but there are a number of risk factors which have not actually been determined as causative:

* abnormalities of the uterus * assisted reproductive techniques * smoking

* previous pregnancies * previous caesareans

Placenta praevia in the last two cases is thought to be related to the amount of scar tissue present, which may result in the embryo not implanting in the usual places higher in the uterus.

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17y ago

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