[1] Univ Pittsburgh, Clin Res Syst Modeling Acute Illness CRISMA Ctr, Dept Crit Care Med, Program Eth & Decis Making,Sch Med, Pittsburgh, PA 15260 USA
[2] Univ Pittsburgh, Palliat Res Ctr, Div Gen Internal Med, Pittsburgh, PA USA
[3] Univ Pittsburgh, Div Gen Internal Med, Sect Palliat Care & Med Eth, Pittsburgh, PA USA