1 Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, University of Minnesota Medical School, Minneapolis, Minnesota.
2 Patient Advocate, Massachusetts General Hospital, Boston, Massachusetts.
3 Department of Neurology, Veterans Affairs Medical Center, Minneapolis, Minnesota.
4 Section of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, West Virginia University School of Medicine, Morgantown, West Virginia.
5 Department of Neurology, Emory School of Medicine, Atlanta, Georgia.