In 2012, the Cochrane Library published a review of dozens of scientific studies involving about 14,700,000 children, which found no credible evidence of an involvement of MMR with either autism or Crohn's disease. The authors stated that "the design and reporting of safety outcomes in MMR vaccine studies, both pre- and post-marketing, are largely inadequate".[12] A June 2014 meta-analysis involving more than 1.25 million children found that "vaccinations are not associated with the development of autism or autism spectrum disorder. Furthermore, the components of the vaccines (thimerosal or mercury) or multiple vaccines (MMR) are not associated with the development of autism or autism spectrum disorder."[139] In July 2014, a systematic review found "strong evidence that MMR vaccine is not associated with autism".[140]