[1] RAND Corp, Santa Monica, CA 90401 USA
[2] VA Greater Los Angeles Hlth Care Syst, Ctr Geriatr Res Educ & Clin, Los Angeles, CA USA
[3] Univ Calif Los Angeles, Multicampus Program Geriatr, Los Angeles, CA USA
[4] Univ Calif Los Angeles, Borun Ctr Gerontol Res, Los Angeles, CA USA