[1] Univ Michigan, Dept Epidemiol, Sch Publ Hlth, 1415 Washington Hts,Suite 2649B, Ann Arbor, MI 48109 USA
[2] Wayne State Univ, Inst Gerontol, Detroit, MI 48202 USA
[3] Michigan State Univ, Coll Human Med, Div Publ Hlth, Flint, MI USA
[4] Michigan State Univ, Coll Human Med, Off Res, E Lansing, MI 48824 USA
[5] Univ Michigan, Inst Social Res, Ann Arbor, MI USA