1. Department of Medicine and
2. Department of Radiology and
3. Division of Research, Kaiser Permanente Northern California, Oakland, California
4. Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California
5. Department of Pulmonary and Critical Care Medicine, Kaiser Permanente, Walnut Creek, California; and
6. Genentech, Inc., South San Francisco, California