Received: 12 January 2021
Accepted: 17 February 2021
First Online: 27 February 2021
Ethics approval and consent to participate
: All participants were informed orally and in writing before giving their written informed consent to participate. All participants could withdraw from the study at any time without giving a reason. The study was approved by the local ethics committee of the Otto-von-Guericke-University Magdeburg presided by Dr. med. Norbert Beck (no. of vote: 155/18 on December 3, 2018) and carried out in line with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.