1 Division of Neurogeriatrics, Department of Neurology, Medical University of Graz, Graz 8036, Austria. Electronic address: reinhold.schmidt@medunigraz.at.
2 Division of Neurogeriatrics, Department of Neurology, Medical University of Graz, Graz 8036, Austria; Institute for Medical Informatics, Statistics and Documentation, Medical University of Graz, Graz 8036, Austria.