Affiliation: | 1. Wayne State University, Division of Pulmonary, Critical Care, and Sleep Medicine, 540 East Canfield Avenue, Detroit, MI 48201, USA;2. Adult Cystic Fibrosis Center, Detroit Medical Center, 3990 John R Street, Detroit, MI 48201, USA;3. Core Clinical Chemistry, Detroit Medical Center, 3990 John R Street, Detroit, MI 48201, USA;4. Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, MA, 02210, USA |