| Affiliation: | 1. Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, 55 Fruit Street, BUL 148, Boston, MA 02114, USA;2. Division of Pulmonary, Critical Care, and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA;3. Department of Medicine, Division of Pulmonary and Critical Care Medicine, University of Washington, Seattle, WA, USA;4. Medical Service, Veterans Affairs Puget Sound Health Care System, 1660 South Columbian Way, Campus Box 358280 (S-111 Pulm), Seattle, WA 98108, USA |
