Scarlette Wiens touches the chin of her father, face-transplant recipient Dallas Wiens. Lightchaser Photography/Brigham and Women's Hospital hide caption

itoggle caption Lightchaser Photography/Brigham and Women's Hospital

Robert O'Rourke was diagnosed with idiopathic pulmonary fibrosis in late 2006. The lung disease causes scarring in the lungs, which makes breathing difficult. Courtesy of Robert O'Rourke hide caption

itoggle caption Courtesy of Robert O'Rourke