[1] Univ Alabama Birmingham, Dept Emergency Med, Birmingham, AL 35294 USA
[2] UAB Comprehens Ctr Hlth Aging, Birmingham, AL 35294 USA
[3] Univ North Carolina Chapel Hill, Dept Med, Div Geriatr Med, Dept Emergency Med, Chapel Hill, NC USA
[4] Washington Univ St Louis, Div Emergency Med, St Louis, MO USA