[1] VA Greater Los Angeles Healthcare Syst 11G, Los Angeles, CA 90073 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Multicampus Program Geriatr Med & Gerontol, Los Angeles, CA 90095 USA
[3] Zynx Hlth Inc, Los Angeles, CA USA
[4] Med Associates Clin, Dubuque, IA USA
[5] Univ So Calif, Daniel J Epstein Dept Ind & Syst Engn, Los Angeles, CA USA
[6] RAND Corp, Santa Monica, CA USA