In this April 9, 2013 photo provided by OSF Saint Francis Medical Center in Peoria, Ill., surgeons perform a landmark windpipe transplant operation on Hannah Warren, 2, at Children’s Hospital of Illinois in Peoria. Hannah was born in South Korea without a windpipe but received a new one made from her own stem cells. She is the youngest patient ever to get the experimental treatment. Doctors announced Tuesday, April 30, 2013, she is recovering and likely will lead a normal life. (AP Photo/Courtesy of OSF Saint Francis Medical Center, Jim Carlson)

Associated Press
In this April 9, 2013 photo provided by OSF Saint Francis Medical Center in Peoria, Ill., surgeons perform a landmark windpipe transplant operation on Hannah Warren, 2, at Children’s Hospital of Illinois in Peoria. Hannah was born in South Korea without a windpipe but received a new one made from her own stem cells. She is the youngest patient ever to get the experimental treatment. Doctors announced Tuesday, April 30, 2013, she is recovering and likely will lead a normal life. (AP Photo/Courtesy of OSF Saint Francis Medical Center, Jim Carlson)
In this April 9, 2013 photo provided by OSF Saint Francis Medical Center in Peoria, Ill., surgeons perform a landmark windpipe transplant operation on Hannah Warren, 2, at Children’s Hospital of Illinois in Peoria. Hannah was born in South Korea without a windpipe but received a new one made from her own stem cells. She is the youngest patient ever to get the experimental treatment. Doctors announced Tuesday, April 30, 2013, she is recovering and likely will lead a normal life. (AP Photo/Courtesy of OSF Saint Francis Medical Center, Jim Carlson)
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