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Not all research literature is contained in databases. Some important research literature will be found in file cabinets, on office shelves, in newsletters, on the internet, etc. This literature is formally labeled Gray Literature.
Gray literature is literature or research does not go through the traditional publication process.
You have to hunt for Gray literature yourself.
Search Engines can find this literature, but only if the Gray literature websites display the content close enough to the top layer of a website, and not behind a search box or pay wall.
Gray literature is the ultimate Deep Web content. And it sometimes requires Advanced Search Skills + Expert Knowledge to locate it. You have to know a website exists and how to get to it.
Now, go to Google, locate the websites of each of these organizations, and then type in HIV prevention into their organizational website Search Box. See if you uncover something interesting...
This kind of search is round-about, willy nilly, get-what-you-get type of search, but it works. Gray literature: it's hit and miss.
The University of Michigan and the University of Illinois at Urbana-Champaign have excellent websites on Gray Literature with loads and loads of places to search. See links below:
The PHPartners website offers a Structured Evidence Queries tool that links directly to Healthy People 2020 Objectives which provides a professionally crafted PubMed Database Search Strategy ready for you to just click on go.
Healthy People 2020 Structured Evidence Queries
Health People 2020 Objectives + PubMed Search