[This corrects the article DOI: 10.2196/mhealth.7208.].
©Mariska Weenk, Harry van Goor, Bas Frietman, Lucien JLPG Engelen, Cornelis JHM van Laarhoven, Jan Smit, Sebastian JH Bredie, Tom H van de Belt. Originally published in JMIR mHealth and uHealth (https://mhealth.jmir.org), 16.07.2021.