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Photo by: Susan Walsh

** FILE ** In this June 10, 2011 photo, Secretary of State Hillary Rodham Clinton waves as the arrives at Lusaka International Airport in Lusaka, Zambia. Clinton has been admitted to a New York hospital after the discovery of a blood clot stemming from the concussion she sustained earlier this month. Spokesman Philippe Reines says her doctors discovered the clot during a follow-up exam Sunday, Dec. 30, 2012. (AP Photo/Susan Walsh, Pool)

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