1. Division of Research, Kaiser Permanente Northern California, Oakland
2. Department of Health System Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California
3. Division of Pulmonary and Critical Care Medicine, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill
4. Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill
5. Department of Radiology, The University of North Carolina at Chapel Hill, Chapel Hill
6. Department of Pulmonary Medicine, Kaiser Permanente Northern California, Vallejo
7. Department of Epidemiology, The University of North Carolina at Chapel Hill, Chapel Hill