[1] Univ Pittsburgh, Sch Med, Pittsburgh, PA USA
[2] Univ Pittsburgh, Sch Med, Dept Crit Care, Pittsburgh, PA USA
[3] Univ Pittsburgh, Sch Med, Dept Neurol, Pittsburgh, PA 15261 USA
[4] Univ Pittsburgh, Sch Med, Dept Med, Sect Palliat Care & Med Eth, Pittsburgh, PA 15213 USA
[5] Univ Pittsburgh, Sch Med, Dept Emergency Med, Pittsburgh, PA USA
[6] Univ Pittsburgh, Sch Med, Program Eth & Decis Making Crit Illness, Dept Crit Care Med, Pittsburgh, PA USA
[7] Univ Pittsburgh, UPMC Presbyterian Hosp, Neurovasc Intens Care Unit, Pittsburgh, PA USA
[8] Univ Pittsburgh, UPMC Presbyterian Hosp, Neurotrauma Intens Care Unit, Pittsburgh, PA USA