Funding for this research was provided by:
Deutsches Zentrum für Neurodegenerative Erkrankungen (BN012)
Received: 28 May 2017
Accepted: 4 October 2017
First Online: 7 February 2018
Ethics approval and consent to participate
: The study protocol was approved by the ethical committees of the medical faculties of all participating sites: the ethical committees of Berlin (Charité, University Medicine), Bonn, Cologne, Göttingen, Magdeburg, Munich (Ludwig-Maximilians-University), Rostock, and Tübingen. The process was led and coordinated by the ethical committee of the medical faculty of the University of Bonn. The registration number of the trial at the ethical committee in Bonn is 117/13.
: Not applicable.
: The authors declare that they have no competing interests with regard to the content of the manuscript.
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