Funding for this research was provided by:
Karl und Veronica Carstens-Stiftung (n.a.)
Received: 21 July 2020
Accepted: 12 January 2021
First Online: 26 January 2021
Ethics approval and consent to participate
: The study was approved by the ethics committee of the Charité –Universitätsmedizin Berlin (EA1/078/09, 25/05/2009). We obtained written consent from each study participant before inclusion.
: Not applicable.
: In addition to his work as a scientist, MT works as a family physician with a specialization in homeopathy. He has also taught homeopathy to students and medical doctors. The other authors do not have any conflicts of interest with regard to the content of this paper.