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LONDON, UNITED KINGDOM - JANUARY 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II, seen wearing trousers and using a crutch, leaves the King Edward VII Hospital after undergoing knee surgery on January 14, 2003 in London, England. The Queen had an operation on her right knee to remove some torn cartilage after injuring her knee walking. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - JANUARY 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II, seen wearing trousers and using a crutch, leaves the King Edward VII Hospital after undergoing knee surgery on January 14, 2003 in London, England. The Queen had an operation on her right knee to remove some torn cartilage after injuring her knee walking. (Photo by Max Mumby/Indigo/Getty Images)