1 Occupational Sleep Medicine, Division of Sleep Medicine, University of Pennsylvania Medical Center; Director, Sleep Medicine Clinic, Philadelphia VA Medical Center, Philadelphia, PA.
2 Johns Hopkins University School of Medicine, Baltimore, MD.
3 Penn State Hershey Sleep Research and Treatment Center, Hummelstown, PA.
4 Oregon Health and Science University, Portland, OR.
5 Division of Sleep Medicine, Department of Psychiatry, Stanford University, Palo Alto, CA.
6 Concentra, Grand Rapids, MI.
7 University of Washington, UW Medicine Sleep Center, Seattle, WA.