Engagement strategies in an assertive outreach context: a mixed-methods systematic review.

Despite the heterogeneity in defining engagement, the relationship between AO professionals and patients emerged as crucial in the process of engagement. Subsequently, the four key principles of AO emerged as central to promoting engagement. Finally, we identified a number of additional principles that are considered crucial in the engagement process in AO. The review concludes with recommendations for future research and the implementation of AO in routine clinical care.