Which cancer was reported as one of the main health impacts of Chernobyl ?
The methodology of the Chernobyl Forum report has been disputed by some advocacy organizations opposed to nuclear energy , such as Greenpeace and the International Physicians for Prevention of Nuclear Warfare ( IPPNW ) , as well as some individuals such as Elisabeth Cardis of the International Agency for Research on Cancer , Dr. Michel Fernex , retired medical doctor from the WHO and campaigner Dr. Christopher Busby ( Green Audit , LLRC ) .