1. Department of Pulmonary Medicine,
2. Department of Thoracic Surgery,
3. Division of Pulmonary and Critical Care Medicine, University of California, San Francisco, San Francisco, California; and
4. Division of Pulmonary, Critical Care, and Sleep Medicine, University of Kansas Medical Center, Kansas City, Missouri
5. Department of Epidemiology, and
6. Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas;