Received: 20 February 2020
Accepted: 30 July 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: Ethical approval and consent for anonymous gathering of opinion and performance data was stated in SupplementalInternalRef removedwhich was read and signed when entering the study. Due to the voluntary non-medical setup without any invasive interventions of this study no ethical committee approval was required [CitationRef removed].
: Written consent for publication has been obtained from the person shown in Fig.InternalRef removed.
: CR is a member of the editorial board of BMC Surgery working as an Associate Editor and was therefore not involved in the publication process. The authors EL, IB and SB declare that they have no competing interests.