[1] Harbor UCLA Med Ctr, Dept Family Med, Los Angeles, CA 90502 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Dept Family Med, Los Angeles, CA 90095 USA
[3] Olive View UCLA Med Ctr, Dept Med, Los Angeles, CA USA
[4] Univ Calif Los Angeles, David Geffen Sch Med, Dept Med, Los Angeles, CA 90095 USA