1. Pulmonary and Critical Care Medicine Division and
2. Department of Microbiology and Immunology, Virginia Commonwealth University, Richmond, Virginia;
3. Pulmonary Division, Kanazawa Medical University, Kanazawa, Japan;
4. Pulmonary Division, Vrije Universiteit Medical Center, Amsterdam, Netherlands;
5. Pulmonary and Critical Care Division, University of Denver, Aurora, Colorado; and
6. Pulmonary Division, Stanford University, Palo Alto, California