Funding for this research was provided by:
Ruhr-Universität Bochum (IN-1214264)
Received: 2 June 2020
Accepted: 15 July 2020
First Online: 29 July 2020
Ethics approval and consent to participate
: The study was designed according to the rules guarding patient privacy and with the approval from the ethics committee of the Ruhr University Bochum (Reference Number 3217–08). All participants provided written informed consent.
: Not applicable
: The IPA has supplied DLD Diagnostika GmbH with the antibodies to produce the Calretinin ELISA kits. In turn, the IPA has received Calretinin ELISA kits at a reduced price and may benefit from future sales of the kits. Otherwise, the individual authors declare no competing interests.