1. Polisher Research Institute, Philadelphia Geriatric Center, Jenkintown, Pennsylvania
2. Harvard University School of Public Health, Center for Risk Analysis, Boston, Massachusetts
3. Harvard Medical School, Boston, Massachusetts
4. Pfizer Inc, Central Research, Groton, Connecticut
5. UCLA School of Medicine, Department of Neurology and Psychiatry, Los Angeles, California
6. Duke University Medical Center, Department of Psychiatry, Center for the Study of Aging, Durham, North Carolina
7. Mt. Sinai Medical Center, Department of Psychiatry, New York, New York