Just-in-Time Adaptive Mechanisms of Popular Mobile Apps for Individuals With Depression: Systematic App Search and Literature Review - Gisbert W Teepe; Ashish Da Fonseca; Birgit Kleim; Nicholas C Jacobson; Alicia Salamanca Sanabria; Lorainne Tudor Car; Elgar Fleisch; Tobias Kowatsch (Journal of Medical Internet Research, 2021)