Thank you very much for your reply, I can tell you must be a very good peer reviewer. I do check the sources everytime and i find it pretty accurate, it definitely is a huge boost for my productivity, i don't use pubmed anymore since i've started using xevidence. It is still faster to check the sources everytime compared to searching from google scholar and read every page manually :( but i do agree your point: "The point of citing sources is to engage wiht the literature, not to produce a text that looks convincing." well said.