1. Division of Pulmonary and Critical Care, Detroit Medical Center - Wayne State University School of Medicine, Detroit, Michigan, United States
2. Division of Pulmonary and Critical Care, John D. Dingell VA Medical Center, Detroit, Michigan, United States
3. Department of Pulmonary, Critical Care and Sleep Medicine, William Beaumont Hospital, Royal Oak, Michigan, United States
4. Department of Pulmonary, Critical Care and Sleep Medicine, Appalachian Regional Healthcare Hospital, Harlan, Kentucky, United States
5. Department of Education, John D. Dingell VA Medical Center, Detroit, Michigan, United States
6. Division of Pulmonary and Critical Care, Cleveland Clinic, Cleveland, Ohio, United States
7. Department of Medical Education, Ascension Providence Hospital, Southfield, Michigan, United States