[1] St Louis Univ, Dept Neurol & Psychiat, Sch Med, St Louis, MO 63104 USA
[2] Univ Florida, Coll Publ Hlth & Hlth Profess, Dept Epidemiol & Biostat, Gainesville, FL USA
[3] Univ Iowa, Coll Publ Hlth, Dept Hlth Management & Policy, Iowa City, IA USA
[4] Washington Univ, Sch Med, Dept Med & Pediat, St Louis, MO USA
[5] Washington Univ, Sch Med, Div Biostat, St Louis, MO 63110 USA
[6] Indiana Univ, Ctr Aging Res, Indianapolis, IN 46204 USA
[7] Regenstrief Inst Inc, Indianapolis, IN USA