Reference works are full of overview articles and are perfect starting points for your research. Not only do you get authoritative content, you also get a recommended reading list which will lead you to other high-quality content.
An introduction to using Wikipedia for Academic Research.
Wikipedia should only be used as a preliminary step in finding better background resources but it can be very useful for locating keywords or key phases, notable researchers or authorities on your topic, and reliable, high-quality resources. Use the references at the end of the article to locate those sources.
Wikipedia is not an appropriate source for healthcare decisions.