1. German Center for Neurodegenerative Diseases; Bonn Germany
2. Clinical Neurosciences; Department of Neurology; University of Bonn; Bonn Germany
3. Department of Medicine; University of Massachusetts Medical School; Worcester MA
4. Rostock Center for the Study of Demographic Change; Rostock Germany
5. Institute for Sociology and Demography, University of Rostock; Rostock Germany
6. Max Planck Institute for Demographic Research; Rostock Germany