1. Department of Neurology, Clinical Dementia Center, University Medical Center Göttingen and German Center for Neurodegenerative Diseases (DZNE) , Göttingen, Germany
2. Departments of Gastroenterology Endocrinology, University Medical Center Göttingen , Göttingen, Germany
3. Network Center for Biomedical Research in Neurodegenerative Diseases, (CIBERNED), Institute Carlos III , Hospitalet De Llobregat, Spain