1. Department of Psychiatry and Behavioral Sciences; Johns Hopkins Bayview Medical Center; Baltimore MD USA
2. Center for Epidemiologic Studies; Utah State University; Logan UT USA
3. Department of Mathematics and Statistics; Utah State University; Logan UT USA
4. Department of Health Sciences Research; Division of Epidemiology, Mayo Clinic; Rochester MN USA
5. Department of Family Consumer and Human Development; Utah State University; Logan UT USA
6. Department of Psychology; Utah State University; Logan UT USA
7. Centre for Studies on Prevention of Alzheimer's Disease, Douglas Mental Health Institute Research Center; and Department of Psychiatry; McGill University Faculty of Medicine; Montreal QC Canada
8. Division of Genetics, Department of Medicine; Brigham and Women's Hospital and Harvard Medical School; Boston MA USA
9. Department of Psychiatry and Behavioral Sciences; Duke University School of Medicine; Durham NC USA