Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01EL1422D)
Received: 23 January 2020
Accepted: 10 April 2020
First Online: 1 May 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study protocol was approved by the Medical Ethics Committee of the Hannover Medical School (MHH) (Nr. 6948), Germany. All procedures performed in human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The local ethics committee has approved the study.
: All subjects signed informed consent.