Several of the few prominent scientists who once voiced doubts about HIV/AIDS have since changed their views and accepted the fact that HIV plays a role in causing AIDS, in response to an accumulation of newer studies and data. Root-Bernstein, author of "Rethinking AIDS: The Tragic Cost of Premature Consensus" and formerly a critic of the causative role of HIV in AIDS, has since distanced himself from the HIV/AIDS denialist movement, saying, "Both the camp that says HIV is a pussycat and the people who claim AIDS is all HIV are wrong...The denialists make claims that are clearly inconsistent with existing studies."