[This corrects the article DOI: 10.2196/mhealth.7254.].
©Thijs Vandenberk, Jelle Stans, Christophe Mortelmans, Ruth Van Haelst, Gertjan Van Schelvergem, Caroline Pelckmans, Christophe JP Smeets, Dorien Lanssens, Hélène De Cannière, Valerie Storms, Inge M Thijs, Bert Vaes, Pieter M Vandervoort. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 14.03.2018.