1. Cool Tips for searching with PubMed https://www. ncbi. nlm. nih
This cool option lets you see how your idea is “trending”. For example is it a dead topic,,,,few new papers or ideas or is it a new one…i.e. Zika Virus was not even known about just three years ago.
This lets you select the type of paper: Clinical, Review of other peoples works, etc
This lets you select for all papers or just the free ($) public access papers
Advanced has some other cool ways to limit your search
This option lets you choose all papers or only those published in the last 5 or a special range of years (i.e. you could select Aug to Aug (last two years)
This is the link to the abstract
for this paper. Click on it and PubMed will bring you to the abstract (paragraph about paper content).

2. Try a PubMed search using limits in your search- click boxes on left side
By selecting “limits”:
“Review” only,
”Full Free Text” only Papers only from last “5 years”
and “human”
an investigator can GREATLY narrow down the search and make their work a lot easier