[1] Med Coll Wisconsin, Green Bay, WI USA
[2] Mayo Clin, Dept Emergency Med, Rochester, MN 55902 USA
[3] Hosp Clin Porto Alegre, Dept Emergency Med, Porto Alegre, Rio Grande do S, Brazil
[4] Mayo Clin, Dept Med, Sect Geriatr Med, Rochester, MN USA
[5] Mayo Clin, Div Hlth Care Delivery Res, Rochester, MN USA
[6] Mayo Clin, Dept Nursing, Rochester, MN USA
[7] Mayo Clin, Dept Med, Sect Palliat Care, Rochester, MN USA
[8] Mayo Clin, Dept Quantitat Hlth Sci, Div Biostat & Informat, Rochester, MN USA