Imagine a patient in critical condition bleeding of multiple stab wounds.

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Some patients taking the drug develop serious bleeding from their lungs, a condition that is fatal-- often in a matter of hours--in more than half the cases in which it occurs.

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Such bleeding may deprive the baby of oxygen - a condition known as fetal hypoxia - and this is turn impacts upon the developing brain, potentially raising the risk of autism.

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About three in 10 men aged over 50 are affected by the condition, which "compresses the water pipe" and can cause broken sleep and bleeding.

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