You can find information to support your research and studies in more places than the traditional journals and books. Grey literature (authoritative information not published commercially) can be found in many places and in many formats. Have a look at the Library's Grey Literature Guide for a general description and some ideas of where to find it.
Grey literature for health (which includes conference papers, clinical guidelines, policies, clinical trials and much more) is rich and plentiful. Check out the Health section of the Grey Literature guide for a comprehensive list of sites.
Statistical information is often found in grey literature and if used wisely it can give an important context to your research presentation.
The websites suggested below will give you a good starting point in finding grey literature, including statistics.