Before everyone starts posting studies they found online and label them as "Facts", I advise you to watch these videos to know how messy these studies, you are quoting, are.
More on the subject of research and selective publishing and how it is misleading doctors before their patients:
http://www.buzzfeed.com/bengoldacre/deworming-trials
http://www.theguardian.com/business/2014/apr/10/tamiflu-saga-drug-trials-big-pharma
Please, don't believe everything you read. Even when it says "studies", "researchers" etc.