1. Department of Mental Health; Bloomberg School of Public Health; Johns Hopkins University; Baltimore; Maryland
2. Division of Geriatrics; Department of Medicine; University of California at San Francisco and San Francisco Veterans Affairs Medical Center; San Francisco; California
3. California Pacific Medical Center Research Institute; San Francisco; California
4. Division of Sleep Medicine; Brigham and Women's Hospital and Beth Israel Deaconess Medical Center; Harvard Medical School; Boston; Massachusetts