1. German Center for Neurodegenerative Diseases, Bonn, Germany
2. Institute for Sociology and Demography, University of Rostock, Germany
3. Rostock Center for the Study of Demographic Change, Germany
4. Aging Research Center, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet and Stockholm University, Sweden
5. Division of Clinical Geriatrics, Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Karolinska Institutet, Stockholm, Sweden
6. Department of Geriatric Medicine, Karolinska University Hospital, Stockholm, Sweden
7. Max Planck Institute for Demographic Research, Rostock, Germany