1. Palliative and Advanced Illness Research (PAIR) Center, University of Pennsylvania Perelman School of Medicine, Philadelphia
2. Sinai Health System, Toronto, Ontario, Canada
3. Department of Medicine, University of Toronto, Toronto, Ontario, Canada
4. Interdepartmental Division of Critical Care, University of Toronto, Toronto, Ontario, Canada
5. Department of Biostatistics and Epidemiology, University of Pennsylvania Perelman School of Medicine, Philadelphia
6. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia
7. Pulmonary and Critical Care of Atlanta, Atlanta, Georgia
8. Wayne State University School of Medicine, Detroit, Michigan
9. University of California, San Diego School of Medicine
10. University of Kentucky College of Medicine, Lexington
11. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia
12. Department of Medical Ethics and Health Policy, University of Pennsylvania, Philadelphia