1. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Duke University, Durham, North Carolina
2. Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Miami Miller School of Medicine, Miami, Florida
3. Division of Critical Care Medicine, Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
4. Margolis Center for Health Policy, Duke University, Durham, North Carolina
5. Department of Population Health Sciences and Department of Medicine, Duke University, Durham, North Carolina