“…This review focused solely on the relationship between contact and information on the one hand and attitudes and social participation on the other hand. As a consequence, only the content and format of the interventions was investigated, and other factors that might have impacted the results were left out of the investigation, such as program duration, frequency and intensity (Leigers and Myers, 2015), the implementation agent (Flay et al, 2005), or the fidelity of implementation (see Carroll et al, 2007). Therefore, it is not possible to ascertain that the effects we derived from the studies were not affected by such factors.…”