1. Department of Veterans Affairs, VA Puget Sound Health Care System, Health Services Research and Development, Seattle, Washington.
2. Biobehavioral Nursing and Health Systems, University of Washington, Seattle, Washington.
3. Divison of Pulmonary and Critical Care Medicine, Department of Medicine, University of Washington, Seattle, Washington.
4. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina.