Funding for this research was provided by:
European Commission (PCIG12-GA-2012-334259)
Alzheimer Forschung Initiative (DE-15-035)
Received: 30 October 2017
Accepted: 15 February 2018
First Online: 6 March 2018
Ethics approval and consent to participate
: The present study was approved by the local ethical board of the Ludwig Maximilian University of Munich, and all participants provided written informed consent. All procedures were performed in accordance with the 1964 Helsinki declaration and its later amendments.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.