Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (DFG GE-2152/1-2)
Deutsche Forschungsgemeinschaft (RTG 2099)
Received: 19 August 2019
Accepted: 25 November 2019
First Online: 5 December 2019
Ethics approval and consent to participate
: This study was approved by the local ethics committee of the University Medical Center Mannheim (Project number 2010-318 N-MA). Written informed consent was obtained by each participant prior to sample acquisition.
: Not applicable.
: The authors declare that they have no competing interests.