1 Section of Pulmonary, Critical Care, Allergy and Immunologic Diseases, Department of Internal Medicine, Wake Forest University School of Medicine, Winston Salem, NC, USA.
2 Department of Anesthesiology, Wake Forest University School of Medicine, Winston Salem, NC, USA.
3 Section of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Miami, Miami, FL, USA.
4 Department of Internal Medicine, Section of Cardiology, Penn State College of Medicine, Hershey, PA, USA.
5 Department of Internal Medicine, Section of Cardiology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
6 Section of Sleep Medicine, Department of Neurology, Wake Forest University School of Medicine, Winston Salem, NC, USA.
7 Department of Anesthesiology, Novant and Piedmont Triad Anesthesia, Winston-Salem, NC, USA.
8 Department of Neurology, Wake Forest School of Medicine, Winston-Salem, NC, USA.