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Up to 25,000 hospital patients die every year in England, of which only around 1,500 are from hospital superbugs. Doctors at King's College hospital in London are leading the way in trying to cut the number of deaths by assessing the risk to surgical patients and giving preventative treatments. Dr Mark Porter hears from patients who have had clots in their legs travel up to their lungs, known as a pulmonary embolism, and finds out what you should do to prevent risk if you end up in hospital.