"In 2005, a meta-analysis by the Cochrane Collaboration found no evidence that hypnotherapy was more successful than other treatments or no treatment in achieving cessation of smoking for at least six months.In 2007, a meta-analysis from the Cochrane Collaboration found that the therapeutic effect of hypnotherapy was "superior to that of a waiting list control or usual medical management, for abdominal pain and composite primary IBS symptoms, in the short term in patients who fail standard medical therapy", with no harmful side-effects.