[1] Univ Maryland, Sch Med, Statewide Hlth Network, Dept Family & Community Med, Baltimore, MD 21201 USA
[2] Univ Maryland, Sch Med, Off Policy & Planning, Baltimore, MD 21201 USA
[3] Univ Calif Irvine, Dept Med, Irvine, CA 92717 USA
[4] Univ Calif Irvine, Chao Family Comprehens Canc Ctr, Irvine, CA 92717 USA