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He had surgery the same day to reduce an intracranial haematoma.

"The knock he took resulted in a haematoma," England captain Ben Stokes said.

And about 1% of the men in the study developed a blood clot or haematoma of the scrotum, while patient leaflets say the risk is 2-10%.

The victim's injuries included impaired eyesight and a haematoma on his brain.

Ken died at 14:21 that afternoon, with the cause of death given as a "very large subdural haematoma" or bleed on the brain.