Affiliations

• ¹ Division of Pulmonary and Critical Care, University of Vermont Medical Center, University of Vermont Larner College of Medicine, Burlington, Vermont.
• ² Division of Pulmonary and Critical Care, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.
• ³ Division of Pulmonary, Critical Care and Sleep Medicine, Harborview Medical Center, University of Washington School of Medicine, Seattle, Washington.