1. Department of Psychiatry, University of Maryland School of Medicine, Baltimore, Maryland;
2. Sleep Disorders Center, Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland;
3. Departments of Neurology and Epidemiology, Columbia University, New York, New York;
4. Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland;
5. ResMed Corp, San Diego, California;
6. Department of Pharmaceutical Health Services Research, University of Maryland School of Pharmacy, Baltimore, Maryland