1 Division of Pulmonary, Allergy and Critical Care, Department of Medicine, Perelman School of Medicine, Philadelphia, PA; Palliative and Advanced Illness Research (PAIR) Center, Perelman School of Medicine, Philadelphia, PA; Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, PA.
2 Division of Pulmonary, Allergy and Critical Care, Department of Medicine, Perelman School of Medicine, Philadelphia, PA; Palliative and Advanced Illness Research (PAIR) Center, Perelman School of Medicine, Philadelphia, PA; Department of Medical Ethics and Health Policy, Perelman School of Medicine, Philadelphia, PA; Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, PA. Electronic address: [email protected].