1. Division of Cardiology, Department of Medicine University of Colorado Anschutz Medical Campus Aurora Colorado USA
2. David Geffen School of Medicine at UCLA Los Angeles California USA
3. Geriatric Research, Education and Clinical Center, VA Greater Los Angeles Healthcare System Los Angeles California USA
4. Division of Pulmonary, Critical Care and Sleep Medicine UC San Diego School of Medicine La Jolla California USA
5. Division of Epidemiology, Department of Family Medicine and Public Health University of California San Diego La Jolla California USA
6. Sleep and Health Research Program, University of Arizona Tucson Arizona USA