1. German Center for Neurodegenerative Diseases, Bonn, Germany
2. Federal Institute for Drugs and Medical Devices, Bonn, Germany
3. German Center for Neurodegenerative Diseases, Bonn, Germany3Department of Psychiatry, University of Bonn, Bonn, Germany
4. German Center for Neurodegenerative Diseases, Bonn, Germany4Rostock Center for the Study of Demographic Change, Rostock, Germany
5. German Center for Neurodegenerative Diseases, Bonn, Germany4Rostock Center for the Study of Demographic Change, Rostock, Germany5Max-Planck-Institute for Demographic Research, Rostock, Germany6Institute for Sociology and Demography, University of Rostock,