[1] Oregon Hlth & Sci Univ, Dept Family Med, Portland, OR 97239 USA
[2] Oregon Hlth & Sci Univ, Dept Med, Portland, OR 97239 USA
[3] Oregon Hlth & Sci Univ, Dept Publ Hlth & Prevent Med, Portland, OR 97239 USA
[4] Oregon Hlth & Sci Univ, Oregon Inst Occupat Hlth Sci, Portland, OR 97239 USA
[5] Kaiser Northwest Ctr Hlth Res, Portland, OR 97227 USA