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In this photo provided by the Murnaghan family, Sarah Murnaghan sits in an ambulance, in Philadelphia Tuesday, Aug. 27, 2013 waiting to be taken home. The Pennsylvania girl whose need for new lungs sparked a national debate on how transplant recipients are prioritized was was discharged from The Children's Hospital of Philadelphia Tuesday. (AP Photo/Murnaghan family) ( Lung Transplant Pennsylvania )

In this handout provided by the Murnaghan family, Sarah Murnaghan, right, poses with her mother, Janet, at Children's Hospital of Philadelphia, Tuesday, Aug. 27, 2013, in Philadelphia. Sarah, the Pennsylvania girl whose need for new lungs sparked a national debate on how transplant recipients are prioritized, was discharged from The Children's Hospital of Philadelphia Tuesday. (AP Photo/Murnaghan family) ( Lung Transplant Pennsylvania )

FILE - In this May 30, 2013 file photo provided by the Murnaghan family, Sarah Murnaghan, center, celebrates the 100th day of her stay in Children's Hospital of Philadelphia with her father, Fran, left, and mother, Janet. The 10-year-old suburban Philadelphia girl received a lung transplant there Wednesday, June 12, 2013, her family said. (AP Photo/Murnaghan Family, File) ( Lung Transplant Pennsylvania )

Lung transplant recipient Sarah Murnaghan waves after arriving home from the hospital Tuesday, Aug. 27, 2013, in Newtown Square, Pa. Murnaghan, who has end-stage cystic fibrosis, received two lung transplants this summer at the Children's Hospital of Philadelphia after a federal judge intervened in her parents' lawsuit challenging national transplant rules that put her at the end of the waiting list for adult lungs. (AP Photo/Matt Rourke) ( Lung Transplant Pennsylvania )

Lung transplant recipient Sarah Murnaghan parents Fran, right, and Janet, speak to members of the media after their daughter arriving home from the hospital Tuesday, Aug. 27, 2013, in Newtown Square, Pa. Sarah Murnaghan, who has end-stage cystic fibrosis, received two lung transplants this summer at the Children's Hospital of Philadelphia after a federal judge intervened in her parents' lawsuit challenging national transplant rules that put her at the end of the waiting list for adult lungs. (AP Photo/Matt Rourke) ( Lung Transplant Pennsylvania )

Lung transplant recipient Sarah Murnaghan's parents, Fran, right, and Janet, speak to members of the media after their daughter arriving home from the hospital Tuesday, Aug. 27, 2013, in Newtown Square, Pa. Sarah Murnaghan, who has end-stage cystic fibrosis, received two lung transplants this summer at the Children's Hospital of Philadelphia after a federal judge intervened in her parents' lawsuit challenging national transplant rules that put her at the end of the waiting list for adult lungs. (AP Photo/Matt Rourke) ( Lung Transplant Pennsylvania )

Lung transplant recipient Sarah Murnaghan, right, accompanied by her sister Ella, 8, center, brothers Finn, 5, left, and Sean, 7, father Fran, and mother Janet, waves during a news conference after arriving home from the hospital Tuesday, Aug. 27, 2013, in Newtown Square, Pa. Sarah Murnaghan, who has end-stage cystic fibrosis, received two lung transplants this summer at the Children's Hospital of Philadelphia after a federal judge intervened in her parents' lawsuit challenging national transplant rules that put her at the end of the waiting list for adult lungs. (AP Photo/Matt Rourke) ( Lung Transplant Pennsylvania )

Lung transplant recipient Sarah Murnaghan's parents, Fran, right, and Janet, speak to members of the media after their daughter arriving home from the hospital Tuesday, Aug. 27, 2013, in Newtown Square, Pa. Sarah Murnaghan, who has end-stage cystic fibrosis, received two lung transplants this summer at the Children's Hospital of Philadelphia after a federal judge intervened in her parents' lawsuit challenging national transplant rules that put her at the end of the waiting list for adult lungs. (AP Photo/Matt Rourke) ( Lung Transplant Pennsylvania )

Lung transplant recipient Sarah Murnaghan, looks up as her mother Janet brushes her hair aside, during a news conference after arriving home from the hospital Tuesday, Aug. 27, 2013, in Newtown Square, Pa. Sarah Murnaghan, who has end-stage cystic fibrosis, received two lung transplants this summer at the Children's Hospital of Philadelphia after a federal judge intervened in her parents' lawsuit challenging national transplant rules that put her at the end of the waiting list for adult lungs. (AP Photo/Matt Rourke) ( Lung Transplant Pennsylvania )

Lung transplant recipient Sarah Murnaghan, right, accompanied by her sister Ella, 8, center, brothers Finn, 5, left, and Sean, 7, father Fran, and mother Janet, meets with members of the media during a news conference after arriving home from the hospital Tuesday, Aug. 27, 2013, in Newtown Square, Pa. Sarah Murnaghan, who has end-stage cystic fibrosis, received two lung transplants this summer at the Children's Hospital of Philadelphia after a federal judge intervened in her parents' lawsuit challenging national transplant rules that put her at the end of the waiting list for adult lungs. (AP Photo/Matt Rourke) ( Lung Transplant Pennsylvania )