机构:
Univ Calif Davis, Dept Internal Med, Sch Med, Div Pulm Crit Care & Sleep Med, Sacramento, CA 95817 USA
VA Northern Calif Hlth Care Syst, Mather, CA USAUniv Calif Davis, Dept Internal Med, Sch Med, Div Pulm Crit Care & Sleep Med, Sacramento, CA 95817 USA