1. Department of Medicine, Northwestern University Feinberg School of Medicine , Division of General Internal Medicine and Geriatrics
2. Department of Medical Education , Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
3. Department of Medicine, Northwestern University Feinberg School of Medicine, Division of Sports Medicine, Chicago, Illinois, USA
4. Department of Medicine, Northwestern University Feinberg School of Medicine, Division of Pulmonary and Critical Care, Chicago, Illinois, USA
5. Department of Medicine, Northwestern University Feinberg School of Medicine, Division of Hospital Medicine, Chicago, Illinois, USA
6. Department of Respiratory Care, Northwestern Memorial Hospital, Chicago, Illinois, USA