Received: 2 June 2020
Accepted: 3 November 2020
First Online: 24 November 2020
Ethics approval and consent to participate
: The institutional review board of the Medical Faculty Mannheim (University of Heidelberg) approved the study (Study-IDs: 2013-502 N-MA, 2007-218 N-MA), and all participants provided written informed consent before participating in the study. The study was carried out in accordance with the declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests with respect to the authorship or the publication of this article.