Funding for this research was provided by:
Received: 16 June 2020
Accepted: 1 February 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: The study was approved by the local ethics committee of the Medical Faculty of the Otto von Guericke University Magdeburg (181/18) and it was in accordance with the Declaration of Helsinki (1964). All participants were informed about the study procedures and provided written informed consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.