1. German Center for Neurodegenerative Diseases (DZNE), Rostock/Greifswald, Greifswald, Germany
2. Institute for Community Medicine, Section Epidemiology of Health Care and Community Health, University Medicine Greifswald, Greifswald, Germany
3. German Center for Neurodegenerative Diseases (DZNE), Rostock/Greifswald, Rostock, Germany
4. Department of Psychosomatic Medicine, Rostock University Medical Center, Rostock, Germany