1. Medicine Institute, Cleveland Clinic, Cleveland, Ohio
2. Pulmonary, Critical Care and Sleep Medicine Division, MetroHealth Medical Center, Cleveland, Ohio
3. Department of Health Sciences, Cleveland Clinic, Cleveland, Ohio
4. Sleep Disorders Center, Neurologic Institute, Respiratory Institute, Heart and Vascular Institute, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
5. Respiratory Institute, Cleveland Clinic, Cleveland, Ohio