1. German Center for Neurodegenerative Diseases (DZNE), Rostock/Greifswald, Greifswald, Germany
2. Department of General Business Administration and Health Care Management, Ernst-Moritz-Arndt-University Greifswald, Greifswald, Germany
3. Institute for Community Medicine, Section Epidemiology of Health Care and Community Health, Ernst-Moritz-Arndt-University Greifswald, Greifswald, Germany