Wikipedia has become more selective in its editing process since it began in January of 2001. However, Wikipedia articles are not citable sources for most academic papers.
A Wikipedia article may be used as a source for gaining background information or finding other reputable sources.
Examples of both a poor and good article are provided below.
Reference sources like Credo Reference which contain reference material may be a better choice.
Try looking for "traumatic brain injury" in Credo Reference and see what kind of sources the articles you retrieve are from.
If there is no author listed on a website, try Alexa or Whois, to identify the owner of the website.
To identify rumors and disinformation on the web, use Snopes.
Examine each of these website groupings about similar topics. Which are credible and which are less than credible. How do you know? Use the information in the rubric above.