However, a supplement to the Lancet study published separately by its authors, as well as subsequent interviews with one of Lancet's authors have disputed the methodology and results of the ILCS study. On the other hand, Jon Pedersen, author of the ILCS study, has disputed the methodology and results of the Lancet study. For more info on this controversy see the sections titled "Criticisms" and "UNDP ILCS study compared to Lancet study" in Lancet surveys of Iraq War casualties.