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The exhaustive search, in theory, should search for everything available on a given subject. This includes:
Searches should seek high sensitivity which may result in low precision.
Too many different search concepts should be avoided, but any pertinent 'synonymous' search terms should be combined with the OR boolean operator within each concept.
would fail to bring back any articles in which brand X medicine did not work or had negative impact.
Can you include previous systematic reviews?
One commonly asked question is whether or not you can include other systematic reviews in your review. The answer is yes BUT you can only use its citation page, i.e. you can use previous reviews that relate to your topic as a way to identify primary literature on that topic from their reference page(s).
You CANNOT use anything from the review itself. To do so would be to introduce that researchers bias and quality of work into your own work, e.g. what conclusions they drew, what quotes or statistics they selectively chose to include or exclude.