[This corrects the article DOI: 10.2196/24260.].
©Eleanor Bailey, Jo Robinson, Mario Alvarez-Jimenez, Maja Nedeljkovic, Lee Valentine, Sarah Bendall, Simon D'Alfonso, Tamsyn Gilbertson, Ben McKechnie, Simon Rice. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 10.06.2021.