1. University of Oklahoma College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
2. Hudson College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
3. Department of Sleep Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
4. Department of Pulmonary, Critical Care & Sleep Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA