[This corrects the article DOI: 10.2196/23180.].
©Matthew Mclaughlin, Tessa Delaney, Alix Hall, Judith Byaruhanga, Paul Mackie, Alice Grady, Kathryn Reilly, Elizabeth Campbell, Rachel Sutherland, John Wiggers, Luke Wolfenden. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 29.03.2021.