1. Center for Regenerative Medicine of Boston University and Boston Medical Center, Boston, Massachusetts;
2. The Pulmonary Center and Department of Medicine, Boston University School of Medicine, Boston, Massachusetts;
3. Department of Medicine, Royal College of Surgeons in Ireland, Education and Research Centre, Beaumont Hospital, Dublin, Ireland;
4. Tissue Engineering Research Group, Royal College of Surgeons in Ireland, Dublin, Ireland;
5. Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania; and
6. Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio