Article History
Received: 16 December 2019
Accepted: 5 July 2020
First Online: 11 July 2020
Ethics approval and consent to participate
: The study did not require ethics approval and consent to participate. All required administrative permissions were obtained in order to use the data. All data were completely de-identified.
: All authors have approved the final version of the manuscript.
: Rieka von der Warth, Philip Hehn, Jan Wolff, and Klaus Kaier declare that they have no conflict of interest.