[This corrects the article DOI: 10.2196/25925.].
©Diana Ramírez-Cifuentes, Ana Freire, Ricardo Baeza-Yates, Nadia Sanz Lamora, Aida Álvarez, Alexandre González-Rodríguez, Meritxell Lozano Rochel, Roger Llobet Vives, Diego Alejandro Velazquez, Josep Maria Gonfaus, Jordi Gonzàlez. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 12.10.2021.