He claimed that owners did not know of the long-term effects of head injury.
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However, some experts say that cycle helmets can actually increase the danger of head injury.
He said 90% of head injury patients died on the way to hospital, so he was "one of the 10%".
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He said youngsters have a higher risk of head injury than adults because their skulls are thinner and less able to absorb shock.
At the extreme end of the scale, the consequences of head injury are death, persistent vegetative state or severe physical and mental disablement.
In complex cases where the diagnosis is unclear or there is a suspicion of coexisting conditions, especially if there is a history of head injury or other brain trauma, a SPECT scan can help.
Types of injuries which would be sent to the Royal Cornwall Hospital include chest pains, strokes, head injury with loss of consciousness, severe abdominal pain and all severely ill children.
It is of course entirely possible that as a result of the head injury Stanford does have amnesia.
The defense maintains that Matthew died as the result of a head injury that occurred before February 4.
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Home Office pathologist Andrew Davidson said Mr Hiles, who was not under the influence of drink or drugs, died of a head injury.
Mr John Firth, a consultant neurosurgeon who speaks on behalf of the head injury charity Headway, told BBC News Online he agreed with the US researchers.
She had also been sexually assaulted and died as a result of a severe head injury.
He suffered a head injury, number of wounds to his chest and abdomen and an injury to his arm.
Soon after kick-off the game had to be halted for 10 minutes because of a worrying head injury to the Dragons' teenage flanker Dan Lydiate.
Those bullets were designed to be accurate to minimise the risk of an accidental head shot - the most common cause of death or injury from a rubber bullet.
Headway is a charity which campaigns on behalf of people who suffer head injury.
Whiplash is characterised by the NHS as a neck injury caused by a sudden movement of the head forwards, backwards or sideways.
The tackle was the "commonest phase of play causing injury" with the head and face the most injured body part, along with sprains or ligament damage.
But Vladimir Weiss's side paid for sitting back on their lead when, in the third minute of injury time, Reid rose to head home Shane Smeltz's left-wing cross.
It has decided to immediately take any child with a head or neck injury out of the game, and to require a doctor's note to allow that child to play again.
"The blast caused a violent collision between her head and the escape hatch area of the vehicle, causing a severe and fatal head injury, " it said.
Four people were taken to Providence Hospital in Washington, including two with back injuries, one with a hip injury and one complaining of dizziness from hitting her head, hospital officials said.
The panel's chairman, Richard Davies, said Dr Patel's report into the death of the girl, who was admitted to hospital with a head injury following what was said to be a "serious fall", gave no details of so-called "marks of violence".
It was to be the Portuguese's final contribution to the match as a head injury he received in the process of making the save ultimately led to him being replaced by Ross Turnbull.
Although she suffered a head injury and later died, the exact of cause of death remains unknown.
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The father-of-four was found with a head injury near his home on Greengate Lane at about 23:15 GMT on 24 December.
Despite losing openside flanker Will Skinner shortly before kick-off - he complained of a dizzy spell having suffered a head injury last weekend - the hosts struck first when Evans stroked over a fourth-minute penalty.
Simon Phillips QC, prosecuting, told the court that pathologist Naomi Carter found 91 separate marks of injury, including 40 bruises and cuts to his head and face, 11 bruises and cuts to his abdomen, seven bruises and cuts to both his arms and 20 injuries to his legs and feet.
At 14, he developed epilepsy from a head injury due to a malicious act at the hands of a 20 year old, ex-Marine, who was looking to impress a girl.
The April 5, 2011 Summary of Guardian Protective Cover Impact Testing by Oregon Ballistics Labs revealed that its series of testing demonstrated that the Guardian reduces the calculated Head Injury Criteria that results in brain injury.
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