1. Department of Medicine, Center for Sleep and Circadian Neurobiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
2. Department of Epidemiology, Program in Public Health, Brown University, Providence, Rhode Island.
3. Department of Family Medicine, Brown University Alpert Medical School, Providence, Rhode Island.
4. Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
5. Center for Chronobiology and Sleep Research, E.P. Bradley Hospital, Brown University, Providence, Rhode Island.
6. Department of Psychiatry and Human Behavior, Brown University Alpert Medical School, Providence, RI.
7. Department of Medicine, Rhode Island Hospital, Providence, RI.
8. Department of Medicine, Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, California.
9. Department of Medicine, University of Massachusetts, Worcester, Worcester, Massachusetts.
10. Department of Medicine, Montefiore and Albert Einstein College of Medicine, New York, New York.
11. Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina.
12. Department of Epidemiology and Medicine, University of Iowa, Iowa City, Iowa.
13. Department of Medicine, University of Florida, Gainesville, Florida.
14. Department of Preventive Medicine, State University of New York, Stony Brook, New York.