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FHI 360 has released a new toolkit for stakeholder engagement in HIV prevention trials, that is likely to be of general interest for research studies. 
From the site:
Clinical trials do not take place in isolation. Local, national and international settings can influence a trial's operations and outcomes. Every trial involves a network of people, organizations and communities. When successful, the process of conducting trials builds capacity and trust among partners who may approach a common goal from different vantage points.
This toolking can be accessed here.
This useful post also has links to Communications Handbook for Clinical Trials: Strategies, Tips and Tools, and, Good Participatory Practice (GPP) Guidelines and Tools for Biomedical HIV Prevention Trials.