[1] Mayo Clin, Div Pulm & Crit Care Med, 200 First St SW, Rochester, MN 55905 USA
[2] Mayo Clin, Biomed Eth Res Program, Rochester, MN USA
[3] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Richard A & Susan F Smith Ctr Outcomes Res Cardiol, Boston, MA USA
[4] Harvard Med Sch, Ctr Bioeth, Boston, MA USA
[5] Univ Calif San Francisco, Dept Med, Div Geriatr, San Francisco, CA USA
[6] San Francisco Med Ctr Vet Affairs, San Francisco, CA USA
[7] Georgetown Univ, Dept Philosophy, Washington, DC USA
[8] Georgetown Univ, Kennedy Inst Eth, Washington, DC USA
[9] Mayo Clin, Div Gen Internal Med, Scottsdale, AZ USA
[10] Univ Minnesota, Med Sch, Minneapolis, MN USA
[11] Univ Minnesota, Law Sch, Minneapolis, MN 55455 USA
[12] Mayo Clin, Div Pulm & Crit Care Med, Rochester, MN USA