[1] Univ Utah, Salt Lake City, UT 84112 USA
[2] VA Roseburg Healthcare Syst, Roseburg, OR USA
[3] Univ Missouri, Columbia, MO USA
[4] Indiana Univ, Bloomington, IN USA
[5] Washington Univ, St Louis, MO USA
[6] Indiana Univ, Kaiser Permanente Washington Hlth Res Inst, Bloomington, IN USA
[7] Univ Washington, Seattle, WA 98195 USA
[8] Univ Oregon, Eugene, OR 97403 USA
[9] Oregon Res Inst, Eugene, OR 97403 USA