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Swansea University plot multiple sclerosis map
Researchers at Swansea University are trying to map out the number of people in Britain who suffer from multiple sclerosis.
It is thought around 100,000 people in the UK have MS - but the real number could be higher, with diagnosis often difficult.
The condition affects the nervous system and can leave a patient unable to walk.
Health correspondent, Hywel Griffith, reports.
