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LONDON, UNITED KINGDOM - JANUARY 06: An NHS sign outside St Thomas' Hospital on January 6, 2015 in London, United Kingdom. Figures released suggest that the NHS in England has missed its four-hour A&E waiting time target with performance dropping to its lowest level for a decade. (Photo by Dan Kitwood/Getty Images)

LONDON, UNITED KINGDOM - JANUARY 06:  An NHS sign outside St Thomas' Hospital on January 6, 2015 in London, United Kingdom. Figures released suggest that the NHS in England has missed its four-hour A&E waiting time target with performance dropping to its lowest level for a decade.  (Photo by Dan Kitwood/Getty Images)