[1] Univ Maryland Baltimore Cty, Gerontol Doctoral Program, 1000 Hilltop Circle, Baltimore, MD 21250 USA
[2] Univ Maryland Baltimore Cty, Dept Sociol Anthropol & Publ Hlth, Baltimore, MD USA
[3] Miami Univ, Dept Sociol & Gerontol, Oxford, OH USA
[4] Miami Univ, Scripps Gerontol Ctr, Oxford, OH USA
[5] RAND Corp, Washington, DC USA
[6] RAND Corp, Santa Monica, CA USA