1. Fred Hutchinson Cancer Research Center, 7286, Clinical Research Division, Seattle, Washington, United States
2. University of Washington, 7284, Division of Pulmonary, Critical Care and Sleep, Seattle, Washington, United States;
3. University of Washington, 7284, Division of Pulmonary, Critical Care and Sleep, Seattle, Washington, United States
4. University of Washington, 7284, School of Public Health, Seattle, Washington, United States
5. University of Washington, Family Medicine, Seattle, Washington, United States
6. Veterans Affairs Puget Sound Healthcare system, Seattle, Washington, United States