[1] Ohio State Univ, Dept Emergency Med, Wexner Med Ctr, Columbus, OH 43210 USA
[2] Northwestern Univ, Feinberg Sch Med, Dept Emergency Med, Ctr Healthcare Studies, Chicago, IL 60611 USA
[3] Univ N Carolina, Dept Emergency Med, Chapel Hill, NC 27515 USA
[4] Univ Western Australia, Sch Med, Emergency Med, Perth, WA, Australia
[5] Univ Leicester, Coll Life Sci, Leicester, Leics, England
[6] Univ Hosp Leicester NHS Trust, Dept Emergency Med, Leicester, Leics, England
[7] Icahn Sch Med Mt Sinai, Brookdale Dept Geriatr & Palliat Med, Dept Emergency Med, New York, NY 10029 USA
[8] James J Peters VAMC, Educ & Clin Ctr, Geriatr Res, Bronx, NY USA
[9] Yale Univ, Bridgeport Hosp, Geriatr Serv, Sch Med, New Haven, CT USA
[10] Massachusetts Gen Hosp, Dept Emergency Med, Boston, MA 02114 USA
[11] Washington Univ, Dept Emergency Med, St Louis, MO 63110 USA