[1] Wayne State Univ, Inst Gerontol, Detroit, MI 48202 USA
[2] Wayne State Univ, Dept Family Med & Publ Hlth Sci, Detroit, MI 48202 USA
[3] Univ Michigan, Inst Social Res, Program Res Black Amer, Ann Arbor, MI USA
[4] Univ Michigan, Ctr Stat Consultat & Res, Ann Arbor, MI USA
[5] Univ Calif Los Angeles, Dept Family Med, Los Angeles, CA USA
[6] Harvard Univ, Sch Publ Hlth, Dept Soc Human Dev & Hlth, Boston, MA 02115 USA