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A taxi stops outside the Milstein Hospital Building at the NewYork-Presbyterian Hospital where U.S. Secretary of State Hillary Clinton was hospitalized in New York, December 31, 2012. Clinton was admitted to a New York hospital on Sunday with a blood clot linked to a concussion she suffered earlier this month, the State Department said in an announcement that looked sure to fuel speculation over the health of one of America's best-known political figures. REUTERS/Eduardo Munoz

A member of the Secret Service stands at the entrance of the Vivian And Seymour Milstein Family Health Center at the NewYork-Presbyterian Hospital where U.S. Secretary of State Hillary Clinton remains hospitalized in New York, January 1, 2013. Clinton suffered a blood clot in a vein between her brain and skull behind her right ear but is expected to make a full recovery, her doctors said on Monday in a statement released by the State Department. REUTERS/Joshua Lott

U.S. Secretary of State Hillary Clinton leaves New York Presbyterian Hospital with daughter, Chelsea (R), in New York, January 2, 2013. The secretary of state, who has not been seen in public since Dec. 7, was revealed on Sunday evening to be in a New York hospital under treatment for a blood clot that stemmed from a concussion she suffered in mid-December. REUTERS/Joshua Lott

U.S. Secretary of State Hillary Clinton leaves New York Presbyterian Hospital with husband, Bill (TOP), and daughter, Chelsea (R), in New York, January 2, 2013. The secretary of state, who has not been seen in public since Dec. 7, was revealed on Sunday evening to be in a New York hospital under treatment for a blood clot that stemmed from a concussion she suffered in mid-December. REUTERS/Joshua Lott

U.S. Secretary of State Hillary Clinton leaves New York Presbyterian Hospital with husband, Bill (TOP R), and daughter, Chelsea (R), in New York, January 2, 2013. The secretary of state, who has not been seen in public since Dec. 7, was revealed on Sunday evening to be in a New York hospital under treatment for a blood clot that stemmed from a concussion she suffered in mid-December. REUTERS/Joshua Lott

Secretary of State Hillary Clinton, center, is transported on the New York Presbyterian Hospital complex Wednesday, Jan. 2, 2013, in New York. Officials say Clinton who was admitted to the New York hospital Sunday continues to be treated with blood thinners to dissolve a clot in the vein behind the right ear. Doctors found the clot during a follow-up exam stemming from a concussion she suffered in early December. (AP Photo/Frank Franklin II)

Members of the Secret Service stand outside the Vivian And Seymour Milstein Family Health Center at the NewYork-Presbyterian Hospital where U.S. Secretary of State Hillary Clinton remains hospitalized in New York, January 1, 2013. Clinton suffered a blood clot in a vein between her brain and skull behind her right ear but is expected to make a full recovery, her doctors said on Monday in a statement released by the State Department. REUTERS/Joshua Lott

Media members report in front of the New York-Presbyterian Hospital where U.S. Secretary of State Hillary Clinton was hospitalized in New York, December 31, 2012. Clinton was admitted to a New York hospital on Sunday with a blood clot linked to a concussion she suffered earlier this month, the State Department said in an announcement that looked sure to fuel speculation over the health of one of America's best-known political figures. REUTERS/Eduardo Munoz

A NYPD officer stands guard at the entrance of the NewYork-Presbyterian Hospital where U.S. Secretary of State Hillary Clinton was hospitalized in New York, December 31, 2012. Clinton was admitted to a New York hospital on Sunday with a blood clot linked to a concussion she suffered earlier this month, the State Department said in an announcement that looked sure to fuel speculation over the health of one of America's best-known political figures. REUTERS/Eduardo Munoz

An ambulance stands in front of New York Presbyterian Hospital in New York, December, 30, 2012. US Secretary of State Hillary Clinton has been hospitalized after suffering a blood clot following an accident earlier this month, her senior State Department aide Philippe Reines said Sunday. She reportedly is being treated with anti-coagulants at New York Presbyterian Hospital where she is expected to stay for the next 48 hours. EMMANUEL DUNAND/AFP/Getty Images