[1] VA Puget Sound Hlth Care Syst, Seattle Epidemiol Res & Informat Ctr, Seattle, WA 98108 USA
[2] Veterans Affairs Puget Sound Hlth Care Syst, Hlth Serv Res & Dev, Seattle, WA USA
[3] Vet Affairs Puget Sound Hlth Care Syst, Primary & Specialty Med Care Serv, Seattle, WA USA
[4] Univ Washington, Dept Epidemiol, Seattle, WA 98195 USA
[5] Univ Washington, Dept Hlth Serv, Seattle, WA 98195 USA
[6] Univ Washington, Dept Med, Seattle, WA 98195 USA
[7] VA New Jersey Hlth Care Syst, E Orange, NJ USA
[8] Univ Med & Dent New Jersey, New Jersey Med Sch, Newark, NJ 07103 USA