[1] Yale Univ, Yale Sch Med, Dept Emergency Med, 464 Congress Ave,Suite 260, New Haven, CT 06519 USA
[2] Univ Maryland, Sch Med, Dept Phys Therapy & Rehabil Sci, Baltimore, MD 21201 USA
[3] Univ Maryland, Sch Med, Dept Epidemiol & Publ Hlth, Baltimore, MD 21201 USA
[4] Univ Wisconsin, BerbeeWalsh Dept Emergency Med, Madison, WI USA
[5] Univ Wisconsin, Ebling Lib, Madison, WI USA
[6] Univ Wisconsin, Dept Med Geriatr & Gerontol, Madison, WI USA
[7] Univ Wisconsin, Dept Populat Hlth Sci, Madison, WI USA
[8] Univ Wisconsin, Ctr Hlth Dispar Res, Madison, WI USA
[9] Univ Wisconsin, Wisconsin Alzheimers Dis Res Ctr, Madison, WI USA