[1] Univ Nebraska Med Ctr, Div Pulm Crit Care & Sleep Med, Omaha, NE USA
[2] Univ Nebraska Med Ctr, Coll Nursing, 985330 Nebraska Med Ctr, Omaha, NE 68198 USA
[3] Childerens Hosp Philadelphia, Philadelphia, PA USA
[4] Univ Penn, Perelman Sch Med, Dept Biostat Epidemiol & Informat, Philadelphia, PA 19104 USA
[5] Univ Penn, Perelman Sch Med, Philadelphia, PA 19104 USA
[6] Palliat & Adv Illness Res PAIR Ctr, Philadelphia, PA USA
[7] Fostering Improvement End Of Life Decis Sci FIELD, Philadelphia, PA USA
[8] Ctr Hlth Incentives & Behav Econ CHIBE, Philadelphia, PA USA
[9] Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA 19104 USA
[10] Univ Penn, Div Pulm Allergy & Crit Care, Perelman Sch Med, Philadelphia, PA 19104 USA