Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (8032808811)
Hessisches Ministerium für Wissenschaft und Kunst (None defined)
Hessian Ministry of Social Affairs and Integration (None defined)
Received: 22 March 2019
Accepted: 9 July 2019
First Online: 29 July 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of the medical faculty of the Justus-Liebig-University of Giessen (AZ: 179/16). All samples were taken as part of standard care procedures.
: Not applicable (no individual person’s data included).
: The authors declare that they have no competing interests.