** FILE ** In this Nov. 16, 2012, file photo, U.S. Secretary of State Hillary Rodham Clinton poses for photographs before a dinner hosted by Singapore's Minister for Foreign Affairs and Law K. Shanmugam, unseen, at Ministry of Foreign Affairs in Singapore. The State Department says Saturday, Dec. 15, 2012, that Clinton, who skipped an overseas trip this past week because of a stomach virus, sustained a concussion after fainting. (AP Photo/Matt Rourke, File)

Photo by: Matt Rourke

** FILE ** In this Nov. 16, 2012, file photo, U.S. Secretary of State Hillary Rodham Clinton poses for photographs before a dinner hosted by Singapore's Minister for Foreign Affairs and Law K. Shanmugam, unseen, at Ministry of Foreign Affairs in Singapore. The State Department says Saturday, Dec. 15, 2012, that Clinton, who skipped an overseas trip this past week because of a stomach virus, sustained a concussion after fainting. (AP Photo/Matt Rourke, File)