[1] Univ Minnesota, Sch Med, Dept Family Med & Community Hlth, 420 Delaware St SE,MMC 381, Minneapolis, MN 55455 USA
[2] Florida Atlantic Univ, Dept Integrated Med Sci, Charles E Schmidt Coll Med, Boca Raton, FL 33431 USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, UCLA JH Borun Ctr Gerontol Res, Los Angeles, CA 90095 USA
[4] Vet Affairs Greater Los Angeles Geriatr Res Educ, Los Angeles, CA USA
[5] RAND Hlth, Santa Monica, CA USA