[1] Univ Washington, Dept Med, Div Gen Internal Med, 325 9th Ave,POB 359780, Seattle, WA 98104 USA
[2] Kaiser Permanente Washington Hlth Res Inst, 1730 Minor Ave, Suite 1600, Seattle, WA 98101 USA
[3] Vet Affairs Puget Sound Hlth Care Syst, Gen Med Serv, 1660 S Columbian Way, Seattle, WA 98108 USA
[4] Univ Washington, Dept Hlth Syst & Populat Hlth, 4060 E Stevens Way NE, Seattle, WA 98195 USA
[5] Univ Washington, Dept Psychiat & Behav Sci, 1959 NE Pacific St,POB 356560, Seattle, WA 98195 USA
[6] Harborview Med Ctr, Div Gen Internal Med, 325 9th Ave,POB 359780, Seattle, WA 98104 USA