| Affiliation: | 1. Research Institute, Palo Alto Medical Foundation, Palo Alto, California, USA;2. Department of Medicine, School of Medicine, Stanford University, Stanford, California, USA;3. Division of Pulmonary and Critical Care Medicine, VA Puget Sound Health Care System, HSR&D, University of Washington, Seattle, Washington, USA;4. Department of Health Policy and Administration, School of Public Health, and Division of Academic Internal Medicine and Geriatrics, Department of Medicine, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA |
