[1] Univ Michigan, Dept Phys Med & Rehabil, 24 Frank Lloyd Wright Dr,POB 344, Ann Arbor, MI 48106 USA
[2] Univ Michigan, GRECC, VA Ann Arbor Hlth Care Syst, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Anesthesiol, Ann Arbor, MI 48109 USA
[4] Univ Michigan, Michigan Inst Clin & Hlth Res, Biostat Core, Ann Arbor, MI 48109 USA
[5] Univ Michigan, Dept Family Med, Ann Arbor, MI 48109 USA
[6] Univ Michigan, Dept Nutr Sci, Ann Arbor, MI 48109 USA