1. German Center for Neurodegenerative Diseases (DZNE) –Rostock/Greifswald, Rostock, Germany
2. Department of Psychosomatic Medicine, University of Rostock, Rostock, Germany
3. German Center for Neurodegenerative Diseases (DZNE) –Rostock/Greifswald, Greifswald, Germany
4. Institute of Community Medicine, University Medicine Greifswald, Greifswald, Germany
5. Institute of General Practice, University of Rostock, Rostock, Germany