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For The One Show, Anita Rani has been investigating near death experiences.

Twenty five British hospitals have agreed to take part in an international studyÌýof the subject. for more information.

Hundreds ofÌýsurvivors have reported near death experience stories, but the evidence, say the experts, isÌýpurely anecdotal.

Psychologist Dr Susan Blackmore believes that there are many medical explanations to why people have near death experiences -Ìýthat they are simply the processes of the body and mind under stress, creating hallucinations.

Have you ever had a near death experience? Are they fact or fantasy?

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