Survivors of the Boston Marathon bombings, Erika Brannock, left, and Rebekah Gregory DiMartino, embrace in their wheelchairs as they head to the finish line of the Boston Marathon Tribute Run in Boston, Saturday, April 19, 2014. Mrs. DiMartino had her left leg amputated Monday following 15 surgeries and months of acute pain, caused by her bombing injury. (AP Photo/Elise Amendola)