Received: 15 May 2020
Accepted: 25 June 2020
First Online: 6 July 2020
Ethics approval and consent to participate
: This methodology paper does not include subjects. But in future, all participants will sign an informed consent to take part in the study in advance. The study is approved by the Ethics committee of the Department of Medicine of the Goethe University Frankfurt am Main (356/17).
: Not applicable.
: The authors declare that they have no competing interests.