1 North Dakota Center for Sleep, Fargo, North Dakota.
2 eviCore Healthcare, Bluffton, South Carolina.
3 Greenville Health System, University of South Carolina, Greenville, South Carolina.
4 University of Michigan Sleep Disorders Center, Ann Arbor, Michigan.
5 Southern California Permanente Medical Group, Kaiser Permanente Fontana Sleep Disorders Center, Fontana, California.
6 Cardiovascular Division, Department of Medicine, University of Virginia, Charlottesville, Virginia.
7 Department of Medicine, University of Washington, Seattle, Washington.
8 Division of Sleep Medicine, Department of Medicine, Department of Neurology, University of Rochester School of Medicine and Dentistry, Rochester, New York.
9 Carolinas Healthcare Medical Group Sleep Services, Charlotte, North Carolina.