1. German Center for Neurodegenerative Diseases (DZNE) site Rostock/Greifswald, Greifswald, Germany
2. Institute for Community Medicine, Section Epidemiology of Health Care and Community Health, University Medicine Greifswald (UMG), Greifswald, Germany
3. Program for Health Economics and Outcome Measures (PHENOM), Hamilton, Canada
4. Department of Health Research Methods, Evidence and Impact (formerly Clinical Epidemiology and Biostatistics), McMaster University, Hamilton, Canada