This two-photo combination shows Dallas Wiens, the recipient of the first full face transplant in the United States. On the left, a December 2010 file photo shows Wiens prior to receiving a full face transplant; and right, shows Wiens as he takes questions from members of the media during a news conference in Boston, Monday, May 9, 2011.

(AP Photo/Wiens Family, Parkland Health and Hospital System in Dallas, and Steven Senne)