1. Sleep Disorders Center, Neurological Institute, Cleveland Clinic, Cleveland, Ohio
2. Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, Minnesota
3. Hospital Internal Medicine, Mayo Clinic, Rochester, Minnesota
4. Department of Neurology, Mayo Clinic, Rochester, Minnesota
5. Center for Sleep Medicine, Mayo Clinic, Rochester, Minnesota
6. Mayo Clinic Alix School of Medicine, Rochester, Minnesota