However, this work by Feinstein has been widely criticized. One review criticized Feinstein's methodology, noting he ignored several research papers that did not show positive effects of EFT, and that Feinstein did not disclose his conflict of interest as an owner of a website that sells energy psychology products such as books and seminars, contrary to the best practices of research publication. Another review criticized Feinstein's conclusion, which was based on research of weak quality and instead concluded that any positive effects of EFT are due to the more traditional psychological techniques rather than any putative "energy" manipulation. A book published on the subject of evidence-based treatment of substance abuse called Feinstein's review "incomplete and misleading" and an example of a poorly performed evidence-based review of research. Feinstein published another review in 2012, concluding that energy psychology techniques "consistently demonstrated strong effect sizes and other positive statistical results that far exceed chance after relatively few treatment sessions". This review was also criticized, where again it was noted that Feinstein dismissed higher quality studies which showed no effects of EFT, in favor of methodologically weaker studies which did show a positive effect.