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)

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