... Across the studies, the reported primary purposes differed considerably. Half of the studies emphasized usability evaluation [24,25,, 10 focused on feasibility [28,31,32,[36][37][38]42,44,48,51] and acceptability [28,32,40,42,47,48,51,56,60], and for 5, effectiveness [32,33,38,48,56] was the main objective. Some of the studies had the purpose of concentrating on patients attitudes, such as satisfaction [25,38], perception [46], openness [47], motivation [64], opinions [59], and adherence to the use of a mobile mental health app [49], whereas others addressed mobile apps, for example, system usage [33,44], app optimization [63,64], validity of a mHealth system [37], efficacy [28], usefulness [44], perceived quality [60], content validity [54], significant features in content [61], safety [49], psychometric properties [36], and health assessment quality [61]. ...