“…This refers to frequency, duration and delivery mode (e.g., via HCP, SMS, SNS) of feedback [ 34 , 36 , 41 , 49 ], as well as components of the intervention in general [ 37 ] and their combinations(s) [ 29 , 36 , 39 , 47 ] and contextual distinctions [ 29 , 37 ]. Some authors call for investigating strategies of tailoring [ 36 ], behavior change techniques the interventions should be based on [ 33 ], and the effectiveness assessment of specific elements like gamification and social media [ 41 , 50 ]. The second subcategory points to a need for a more holistic [ 29 ], standardized [ 37 ] and theory-grounded [ 31 , 36 , 50 ] assessment of interventions’ features and functionalities.…”