[1] Portland VA Med Ctr, Portland, OR 97239 USA
[2] Oregon Hlth & Sci Univ, Dept Med Informat & Clin Epidemiol, Portland, OR 97201 USA
[3] Oregon Hlth & Sci Univ, Sch Nursing, Portland, OR 97201 USA
[4] Oregon Hlth & Sci Univ, Sch Med, Portland, OR 97201 USA
[5] Vet Hlth Adm, Vet & Consumers Hlth Informat Off, Off Informat & Analyt, Washington, DC USA
[6] Iowa City VA Hlth Care Syst, Ctr Comprehens Access & Delivery Res & Evaluat, Iowa City, IA USA
[7] VA Puget Sound Hlth Care Syst, Seattle, WA USA