1. The Danish Aging Research Center, and The Danish twin Registry Institute of Public Health University of Southern Denmark Odense Denmark
2. Max Planck Odense Center on the Biodemography of Aging Institute of Public Health University of Southern Denmark Odense Denmark
3. Department of Clinical Genetics Odense University Hospital Odense Denmark
4. Max Planck Institute for Demographic Research Rostock Germany
5. The Center for Human Development and Aging New Jersey Medical School University of Medicine and Dentistry of New Jersey Newark NJ USA
6. Department of Psychology University of Minnesota Minneapolis MN USA
7. Department of Clinical Biochemistry and Pharmacology Odense University Hospital Odense Denmark