1. Department of Medicine, Division of Infectious Diseases, Santa Clara Valley Medical Center and California Institute for Medical Research, San Jose, and Department of Medicine, Division of Infectious Diseases and Geographic Medicine, Stanford University, Stanford, CA
2. DNAX Research Institute of Molecular and Cellular Biology, Inc., Palo Alto
3. Lung Biology Center, University of California, San Francisco
4. Department of Pathology, Stanford University, Stanford, and Palo Alto Veterans Affairs Health Care System, Palo Alto, CA, USA