[This corrects the article DOI: 10.2196/15171.].
©Harry J Witchel, Georgina A Thompson, Christopher I Jones, Carina E I Westling, Juan Romero, Alessia Nicotra, Bruno Maag, Hugo D Critchley. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 13.04.2021.