1 Sleep Disorders Center Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA.
2 Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA; Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA.
3 Sleep Disorders Center Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA; Heart, Vascular, and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio, USA; Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA; Respiratory Institute Cleveland Clinic, Cleveland, Ohio, USA. Electronic address: mehrar@ccf.org.