1. Department of Biomedical Engineering, Yale University, New Haven, Connecticut.
2. Department of Anesthesia, Yale University School of Medicine, New Haven, Connecticut.
3. Cystic Fibrosis/Pulmonary Research Treatment Center, University of North Carolina, Chapel Hill, North Carolina.
4. Section of Pulmonary, Critical Care, and Sleep Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut.