FILE - In this Thursday, Aug. 22, 2013 file photo, former first lady Barbara Bush listens to a patient's question during a visit to the Barbara Bush Children's Hospital at Maine Medical Center in Portland, Maine. Former first lady Barbara Bush has been hospitalized in Houston with a respiratory-related issue, Tuesday, Dec. 31, 2013.  A statement Tuesday night from the office of her husband, former President George H.W. Bush, said she was admitted to Houston Methodist Hospital on Monday. (AP Photo/Robert F. Bukaty, File)

Photo by: Robert F. Bukaty

FILE - In this Thursday, Aug. 22, 2013 file photo, former first lady Barbara Bush listens to a patient's question during a visit to the Barbara Bush Children's Hospital at Maine Medical Center in Portland, Maine. Former first lady Barbara Bush has been hospitalized in Houston with a respiratory-related issue, Tuesday, Dec. 31, 2013. A statement Tuesday night from the office of her husband, former President George H.W. Bush, said she was admitted to Houston Methodist Hospital on Monday. (AP Photo/Robert F. Bukaty, File)