Click on the link to the Research page in the top menu, and at the foot of that page download the document, “Reiki – The Body of Evidence”. Look in the contents for whatever illness or condition you are researching.
Another good place to look would be Google Scholar. Go into Google and key in scholar in the search window: a link to Google Scholar will then appear at the top of the next page. Click on it, and you’ll then be in Google Scholar itself. Key in Reiki and the condition (e.g. cancer), press ‘return’ and see what you get.
Finally, again in “Reiki – The Body of Evidence”, look in the contents page for “other possible reference sources”, and follow those links.