[This corrects the article DOI: 10.2196/27348.].
©Gunnar Völkel, Axel Fürstberger, Julian D Schwab, Silke D Werle, Nensi Ikonomi, Thomas Gscheidmeier, Johann M Kraus, Alexander Groß, Martin Holderried, Julien Balig, Franz Jobst, Peter Kuhn, Klaus A Kuhn, Oliver Kohlbacher, Udo X Kaisers, Thomas Seufferlein, Hans A Kestler. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 21.06.2021.