Peer-review of the Lancet study:
"Given the controversy surrounding the previous Iraq paper that we published, it is worth emphasising the quality of this latest report
as judged by four expert peers who provided detailed comments to editors.
All reviewers recommended publication with relatively minor revisions. For example, one adviser noted that “this is an important piece of research which should be published because it is possibly the only non-government funded scientific study to provide an estimate of the number of Iraqi deaths since the US invasion.” She underscored the
“powerful strength” of the research methods, a view supported by other reviewers. Indeed, this study adds substantially to the new field of conflict epidemiology, which has been evolving rapidly in recent years."
http://www.thelancet.com/journals/lancet/article/PIIS0140673606694920/fulltext