Published on in Vol 9, No 5 (2021): May
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/27172, first published
                                    .
                                

1 Faculty of Medicine, Masaryk University, Brno, Czech Republic
2 Institute of Biostatistics and Analyses, Ltd, Brno, Czech Republic
